Viewing/Searching java arrays and collections in the Eclipse Java debugger is tedious and time-consuming.
I tried this promising plugin (in alpha as of Aug 2012)
http://www.cvast.tuwien.ac.at/projects/visualdebugging/ArrayExplorer
But it freezes Eclipse for simple arrays beyond a few hundred elements.
I do use Detail formatters, but that still needs clicking on each element to see the values.
Are there any better ways to view this array/collection data?
Use the 'Expressions' tab.
There you can type in any number of expressions and have them evaluated in the current scope.
ie: collection.size(), collection.getValueAt(i), ect...
Eclipse > Preferences > Java > Debug >Detail Formatter
This may be close to what you are looking for. It is another tedious work to setup but once done you can see the value of objects in Expressions window.
Here is link to start
override toString method of your class and you will be able to see what you want to see. i'm attaching example to show you exactly that.
Even though i could not find a way to see them in nice table/array, i found a halfway workaround.
The solution is to define a static method in a throwaway class that takes the array as input and returns a string of concatenated values that one wants to quickly glance at. it could include the array index and newlines to view results formatted nicely. It can be fine tuned to print out only certain array indices to reduce clutter.
This static method can then be used in the watch area.
Related
I need to add an array of non-adjacent cells to my array formula. I have tried all of the following array constant-like ways and they all give me a "There is a problem with this formula error".
'Chart Data'!{A12:A14,D3:D11}
{'Chart Data'!A12:A14,'Chart Data'!D3:D11}
'Chart Data'!{A12,A13,A14,D3:D11}
{'Chart Data'!A12,'Chart Data'!A13,'Chart Data'!A14,'Chart Data'!D3:D11}
'Chart Data'!{A12,A13,A14,D3,D4,D5,D6,D7,D8,D9,D10,D11}
{'Chart Data'!A12,'Chart Data'!A13,'Chart Data'!A14,'Chart Data'!D3,'Chart Data'!D4,'Chart Data'!D5,'Chart Data'!D6,'Chart Data'!D7,'Chart Data'!D8,'Chart Data'!D9,'Chart Data'!D10,'Chart Data'!D11}
Entire formula (the array constant goes where the {#####} is):
{=SUM(((1-References!M1:M12)*({#####}*(G3:G14+F3:F14-0.11)))+((References!M1:M12)*('Chart Data'!A12:A23*(G3:G14+F3:F14-0.11)))+((H2:H13*X3:X14)+(H3:H14*Y3:Y14)+(I2:I13*(V3:V14-X3:X14))+(I3:I14*(W3:W14-Y3:Y14))))}
I am 100% positive that it is this particular array constant that is causing the problem. I can't move the cells I'm referencing to put them in line. Is it even possible to reference a non-adjacent range in an array formula? If it's possible, what am I doing wrong?
There are several ways to do this. The following is very simple and pretty direct so my favorite.
EITHER choose a cell to build your string for your non-contiguous array in OR create a Named Range to do it. I'll show the first as it seems nicest for being able to use the mouse freely, but in both of them you can actually be creative using about how you build the string that will become your array. The main advantage of creating it in a Named Range is no helper cell lying about anywhere.
So, you create that string and then make it an array. Say you have a non-contiguous array needed using cells A12:A14 and C3:C11. You use joining and TEXTJOIN() like so:
="{"&TEXTJOIN(",",FALSE,B12:B14,C3:C11)&"}"
to create a text string of the values in those cells wrapped with the curly braces ({}) just as if you'd typed it in ("hardcoded it"). It will look like this with the right values in those cells:
{1,2,3,1,2,3,4,5,6,7,8,9}
but is ain't an array yet.
Now the magic in THIS method. Create a Named Range, perhaps called String2Array, and give it a formula of:
=EVALUATE(A1)
(or whatever cell you used for the above formula creating the text string that you want to be an array). Make the reference absolute. ($A$1... which it will do for you, just don't edit it to be relative. If you use this for similar work, but need it relative, that will work fine, but it just isn't what is needed here.)
Now replace your placeholder in the formula with the Named Range's name (perhaps you DID use String2Array). And you're done.
A couple other methods use INDEX() or CHOOSE() and you can force things to be arrays using the functions DOLLARDE() and IMREAL() (I found on a helpsite in a 2014 post) and some others do the same kind of thing. In those days, one had to use {CSE} too, but SPILL takes care of that now (with those two weird-seeming friendlies and at least two others). The poster was someone I've seen on this site, EXCELXOR was the name for the site, XOR LX was the name of the member here though the functions were mentioned in a comment by a Lori. Since he covers, it seems, aspects not usually covered in helpsites, looking up some of his work here, or elsewhere too, might be worthwhile to some folks.
But this method is very direct and therefore easy to maintain. And personally, I love the idea that EVALUATE() (must be used IN the Named Range functionality, not cell-side) is the gift that keeps on giving, one wonderfully helpful thing after another.
So many ways. You could even literally build the array in a helper column/row somewhere and reference THAT instead of the non-contiguous addresses. I like the joining+TEXTJOIN() approach best because I can use the mouse to easily get all the blocks into the formula since it is a LIVE formula. But you can type out a string fairly easily too and add the {}'s. Or perhaps a user would type a string of addresses and you'd add them like the formula does above. And you can insert actual values (constants) into the string you are building as well if that is appropriate. And you could build it formulaicly... I wouldn't pick that workload first thing off the pile of choices, but if you were going to do it anyway already, then... or if it's a small build.
I am learning Ruby, reading few books, tutorials, foruns and so one... so, I am brand new to this.
I am trying to develop a stock system so I can learn doing.
My questions are the following:
I created the following to store transactions: (just few parts of the code)
transactions.push type: "BUY", date: Date.strptime(date.to_s, '%d/%m/%Y'), quantity: quantity, price: price.to_money(:BRL), fees: fees.to_money(:BRL)
And one colleague here suggested to create a Transaction class to store this.
So, for the next storage information that I had, I did:
#dividends_from_stock << DividendsFromStock.new(row["Approved"], row["Value"], row["Type"], row["Last Day With"], row["Payment Day"])
Now, FIRST question: which way is better? Hash in Array or Object in Array? And why?
This #dividends_from_stock is returned by the method 'dividends'.
I want to find all the dividends that were paid above a specific date:
puts ciel3.dividends.find_all {|dividend| Date.parse(dividend.last_day_with) > Date.parse('12/05/2014')}
I get the following:
#<DividendsFromStock:0x2785e60>
#<DividendsFromStock:0x2785410>
#<DividendsFromStock:0x2784a68>
#<DividendsFromStock:0x27840c0>
#<DividendsFromStock:0x1ec91f8>
#<DividendsFromStock:0x2797ce0>
#<DividendsFromStock:0x2797338>
#<DividendsFromStock:0x2796990>
Ok with this I am able to spot (I think) all the objects that has date higher than the 12/05/2014. But (SECOND question) how can I get the information regarding the 'value' (or other information) stored inside the objects?
Generally it is always better to define classes. Classes have names. They will help you understand what is going on when your program gets big. You can always see the class of each variable like this: var.class. If you use hashes everywhere, you will be confused because these calls will always return Hash. But if you define classes for things, you will see your class names.
Define methods in your classes that return the information you need. If you define a method called to_s, Ruby will call it behind the scenes on the object when you print it or use it in an interpolation (puts "Some #{var} here").
You probably want a first-class model of some kind to represent the concept of a trade/transaction and a list of transactions that serves as a ledger.
I'd advise steering closer to a database for this instead of manipulating toy objects in memory. Sequel can be a pretty simple ORM if used minimally, but ActiveRecord is often a lot more beginner friendly and has fewer sharp edges.
Using naked hashes or arrays is good for prototyping and seeing if something works in principle. Beyond that it's important to give things proper classes so you can relate them properly and start to refine how these things fit together.
I'd even start with TransactionHistory being a class derived from Array where you get all that functionality for free, then can go and add on custom things as necessary.
For example, you have a pretty gnarly interface to DividendsFromStock which could be cleaned up by having that format of row be accepted to the initialize function as-is.
Don't forget to write a to_s or inspect method for any custom classes you want to be able to print or have a look at. These are usually super simple to write and come in very handy when debugging.
thank you!
I will answer my question, based on the information provided by tadman and Ilya Vassilevsky (and also B. Seven).
1- It is better to create a class, and the objects. It will help me organize my code, and debug. Localize who is who and doing what. Also seems better to use with DB.
2- I am a little bit shamed with my question after figure out the solution. It is far simpler than I was thinking. Just needed two steps:
willpay = ciel3.dividends.find_all {|dividend| Date.parse(dividend.last_day_with) > Date.parse('10/09/2015')}
willpay.each do |dividend|
puts "#{ciel3.code} has approved #{dividend.type} on #{dividend.approved} and will pay by #{dividend.payment_day} the value of #{dividend.value.format} per share, for those that had the asset on #{dividend.last_day_with}"
puts
end
I'm performing gaussian mixture model classification, and based on that, used "mvnpdf" function in MATLAB.
As far as I know the function returns a multi variate probability density for the data points or elements passed to it.
However I'm trying to recreate it on C and I assumed that mvnpdf is the regular Gaussian distribution (clearly it is not) because the results don't match.
Does anyone know how "mvnpdf" works ? Because I haven't been able to find documentation on it .
The documentation for mvnpdf is here
if you are looking for the exact code just put a break point at the point where you call it and see how it works
Okay I actually found a decent link that explains in detail what's happening inside .
This might be a better link to look at - http://octave.sourceforge.net/statistics/function/mvnpdf.html
I'm currently writing an eBook reader for Windows Phone Seven, and I'm trying to style it like the Kindle reader. In order to do so, I need to split my books up into pages, and this is going to get a lot more complex when variable font sizes are added.
To do this at the moment, I just add a word at a time into the textblock until it becomes higher than its container. As you can imagine though, with a document of over 120,000 words, this takes an unacceptable period of time.
Is there a way I can find out when the text would exceed the bounds (logically dividing it into pages), without having to actually render it? That way I'd be able to run it in a background thread so the user can keep reading in the meantime.
So far, the only idea that has occurred to me is to find out how the textblock decides its bounds (in the measure call?), but I have no idea how to find that code, because reflector didn't show anything.
Thanks in advance!
From what I can see the Kindle app appears to use a similar algorithm to the one you suggest. Note that:
it generally shows the % position through the book - it doesn't show total number of pages.
if you change the font size, then the first word on the page remains the same (so that's where the % comes from) - so the Kindle app just does one page worth of repagination assuming the first word of the page stays the same.
if you change the font size and then scroll back to the first page, then actually there is a discontinuity - they pull content forwards again in order to fill the first page.
Based on this, I would suggest you do not index the whole book. Instead just concentrate on the current page based on a "position" of some kind (e.g. character count - displayed as a percentage). If you have to do something on a background thread, then just look at the next page (and maybe the prev page) in order that scrolling can be more responsive.
Further to optimise your experience, there are a couple of changes you could make to your current algorithm that you could try:
try a different starting point and search increment for your algorithm - no need to start at one word and to then only add one word at a time.
assuming most of your books are ASCII, try caching the width of the common characters, and then work out the width of textblocks yourself.
Beyond that, I'd also quite like to try using <Run> blocks within your TextBlock - it may be possible to get the relative position of each Run within the TextBlock - although I've not managed to do this yet.
I do something similar to adjust font size for individual textboxes (to ensure they all fit). Basically, I create a TextBlock in code, set all my properties and check the ActualWidth and ActualHeight properties. Here is some pseudo code to help with your problem:
public static String PageText(TextBlock txtPage, String BookText)
{
TextBlock t = new TextBlock();
t.FontFamily = txtPage.FontFamily;
t.FontStyle = txtPage.FontStyle;
t.FontWeight = txtPage.FontWeight;
t.FontSize = txtPage.FontSize;
t.Text = BookText;
Size Actual = new Size();
Actual.Width = t.ActualWidth;
Actual.Height = t.ActualHeight;
if(Actual.Height <= txtPage.ActualHeight)
return BookText;
Double hRatio = txtPage.ActualHeight / Actual.Height;
return s.Substring((int)((s.Length - 1) * hRatio));
}
The above is untested code, but hopefully can get you started. Basically it sees if the text can fit in the box, if so you're good to go. If not, it finds out what percentage of the text can fit and returns it. This does not take word breaks into account, and may not be a perfect match, but should get you close.
You could alter this code to return the length rather than the actual substring and use that as your page size. Creating the textblock in code (with no display) actually performs pretty well (I do it in some table views with no noticeable lag). I wouldn't send all 120,000 words to this function, but a reasonable subset of some sort.
Once you have the ideal length you can use a RegEx to split the book into pages. There are examples on this site of RegEx that break on word boundaries after a specific length.
Another option, is to calculate page size ahead of time for each potential fontsize (and hardcode it with a switch statement). This could easily get crazy if you are allowing any font and any size combinations, and would be awful if you allowed mixed fonts/sizes, but would perform very well. Most likely you have a particular range of readable sizes, and just a few fonts. Creating a test app to calculate the text length of a page for each of these combinations wouldn't be that hard and would probably make your life easier - even if it doesn't "feel" right as a programmer :)
I didn't find any reference to this example from Microsoft called: "Principles of Pagination".
It has some interesting sample code running in Windows Phone.
http://msdn.microsoft.com/en-us/magazine/hh205757.aspx
You can also look this article about Page Transitions in Windows Phone and this other about the final touches in the E-Book project.
The code is downloadable: http://archive.msdn.microsoft.com/mag201111UIFrontiers/Release/ProjectReleases.aspx?ReleaseId=5776
You can query the FormattedText class that is used AFAIK inside textBlock. since this is the class being used to format text in preparation for Rendering, this is the most lower-level class available, and should be fast.
First post here. Using C in Visual Studio 2008. Can work with VS 2005 if necessary.
How do I display numerical data in arrays as in a spreadsheet?
How do I plot numerical data in arrays?
These seem to be simple questions. But I cannot find solutions. So far, I would print the data to a file, import into Excel and view/plot. However, with this code there are too many arrays--so the print/import/plot is tiring.
Some constraints.
I do not want to write 20+ lines of code to do the above. MATFOR or Array Visualizer let you do the plotting with a one line function call.
They cannot display the data in a convenient format. I would like to display the data and the plot in one or two windows so that they are visible simultaneously.
This is a win32 console application---all the code is portable.
Will be using these during debugging.
Free or paid.
While I am looking for something specific, the requirements are substantially the same for any one doing numerical work with arrays and matrices--displaying data and plot simultaneously.
I am hoping that a such a tool has been written and is available.
I am also open to a solution that outputs the array data to an Excel sheet (can keep Excel open) and if it can also plot that can be great but I can live without plotting.
PS: I need this only when debugging the code.
I use ArrayDebugView which is a plug-in you install in Visual studio and draws graphs out of arrays while you are debugging your application. It works as a visual way of variable watch in debug mode. You don't need to write a line of code.
I can't think of any library that would enable what you want in a console app in less than 20 lines of code. My suggestion would be instead to script the plotting-step using MATLAB og GNU Octave to do the actual plotting.
In order to display numerical data in array, you should add the pointer to the first data element you want to observe, into the watch --- if you want to observe the array from the beginning, it would just be the array name, which is the pointer to the first element. In order to view more then one element, you add a "," after the pointer, followed by the number of element you want to observe.
For example, in order to observe the elements of float farray[100];, you should add to the watch farray,100.
In order to plot, you can copy-paste from the watch to your plotting software (i.e. excel), but it is not very convenient as you cannot copy the data column alone, but the columns to the left and right as well, so it involves extra manual editing.
I use GNUPlot (http://www.gnuplot.info/) to display my performance/speedup measurements.
I print my numbers to stdout and wrote a bash script that combines these numbers and calls gnuplot for rendering.
I made a simple plotting program for that purpose. There is only a textbox where I paste the data and a chart where it's drawn.
The data needs to be in either form:
with an automatic X (increment by 1 for each value): seriesName value
for both X and Y specified: seriesName xvalue yvalue
Most of the time I used to plot data from tracepoints.
I copy/paste the whole output window of VS, the plotting program ignores anything that doesn't follow these 2 forms (so I don't have to cleanup the string and put it in excel and all).
It does line, point, colum, area charts and save image, copy to clipboard.
MiniPlot
There are several ways to do this but this will require writing some code. Visualizing data is generally easy and straight forward but visualizing data exactly the way you want them to look will require some additional code and work.
There are several options to visualize data:
A combination of BASH and GNUPLOT
Use MATLAB or OCTAVE for all your calculations and visualization
Use PYTHON and SciPy and matlibplot libraries.
Gnuplot is a great tool to plot data but it is cumbersome to use. It looks fabulous if you invest time to get the plots right and combines excellent with LaTeX and has a good fit implementation for arbitrary functions. Visit http://gnuplot-tricks.blogspot.ch/ great site to learn all about gnuplot.
Numerical programs such as MATLAB and it's open source equivalent OCTAVE are great because they are fast implementation languages for numerical programs and have extensive additional libraries especially MATLAB. For high load numerical computing it is really slow and the plot library is only good for basic plotting needs.
Using PYTHON and its scientific programing libraries (SciPy and matlibplot) are a great combination. This allows excellent plot which are not as cryptic as gnuplot to plrogram and it is more flexible than MATLAB in plotting. Additionally it gives you a environment for numerical programing like MATLAB.