In FMI 2.0, array parameters are serialized to scalar variables.
Importing tools can display them as arrays, but their size is fixed and their handling is inefficient.
Better array support is currently in development by a working group of the FMI project, but I would like to know about workarounds how to handle array parameters in the meantime.
Ideas are to
hard code them (disadvantage: the are no paramters any more ...)
put them in a CSV file in the resources folder and read them at the start of the simulation (disadvantage: no parameter mask support, complicated)
put them in a string parameter and parse it at simulation start (disadvantage: limited length of strings, complicated)
Are there other ideas / workarounds? Thanks in advance.
Combinations of the ideas outlined in your question are also possible.
Hard code with selector parameter
Here the idea is to hard code several variants of your array and allow the user to select one with a parameter.
I did this in a recent project where a user needed to choose between different spatially resolved initial conditions (e.g. temperature profiles). We used a model to generate more than 100 different sets of spatially resolved initial conditions (each representing a different "history" of the modeled object), hard coded them as FORTRAN arrays (the inner core of the FMU was in FORTRAN), and used a single integer parameter to select which profile he wanted to use.
It worked very well and the user has no way of breaking it.
Shorten the array and interpolate
If the data in your array is smooth, you might be able to dramatically reduce the number of values you actually need to pass to your simulation - which would make serialization into scalar parameters less painful.
Within the FMU, interpolate to get the resolution you need.
String parameter to select csv file
You can use a string parameter to provide the path to a user-provided csv-file. I would not recommend this, because the user will most likely break it.
Related
When I append arrays in google spreadsheets, all of the resulting elements are not rendered in cells. For example, if I enter the formula:
={{1,2,3}, {4,5,6}}
the values rendered in spreadsheet cells are 1,4,5,6. Any ideas about why this is happening, or alternatives? My broader problem is to accumulate rows from separate sheets into another sheet - I can do that via
={ImportRange(...), ImportRange(...)}
but the same problem is apparent (missing the second element and beyond from the first array).
Edit (2 Oct 2014)
I just happened upon this when someone upvoted. The information below is obsolete in the newest version of Sheets - you can now (have been able to for a few months) concatenate arrays inside embedded arrays. All the examples that I provided below will work, including the one I said "shouldn't work".
Embedded arrays in Google Sheets
An array of values may be populated by a single function using an embedded array. Each element in the embedded array (and this may be point of conjecture; it is more or less just my opinion) represents the value that will be populated in contiguous cells in the sheet. Semi-colons are row delimiters; commas (or backslashes in locales that use a comma for a decimal separator) are column delimiters. So this will successfully create a two-row, three-column array (all of the following examples assume a locale supporting comma column delimiters):
={1,2,3;4,5,6}
Embedded arrays within embedded arrays
As each element in an embedded array represents a cell in the spreadsheet, I think it is reasonable to assume that one should be able to populate a cell with another embedded array, as long as it does not overwrite other elements in the outer embedded array. So IMO something like this should (see point 3) be successful:
={{1;2;3},{4;5;6}}
However something like this shouldn't work (again IMO), as the second and third elements of the first embedded array would be "overwriting" the second embedded array:
={{1,2,3},{4,5,6}}
There is a bug associated with the first embedded array inside an embedded array
As +Jason pointed out, something like ={{1;2;3},{4;5;6},{7;8;9}} doesn't work in that the first embedded array only populates one element (but every other column is populated correctly). It is also interesting that that one element is auto-converted to a text string. This is (unfortunately) a long standing bug in Google Sheets. The same thing occurs when you attempt to invoke the SPLIT() function on an array (every element in the array is split successfully except for the first one).
I don't think embedded arrays within embedded arrays will help with your broader problem anyway
Embedded arrays can't really be used to append one array on to end of another anyway (due to the "overwriting" effect), and there is no native function that can do it directly. The VMERGE function which you can obtain via the Script gallery (credit to +ahab) will work out of the box:
=VMERGE(ImportRange(...);ImportRange(...);...)
or you can use native functions to do some string manipulation to achieve this. For example, for one-dimensional arrays:
=ArrayFormula(TRANSPOSE(SPLIT(CONCATENATE(ImportRange("key1";"A1:A10")&CHAR(9);ImportRange("key2";"A1:A10")&CHAR(9));CHAR(9))))
but as well as being clunky and not very readable, this type of formula can be very expensive performance-wise for large data sets (I would tend to recommend the VMERGE custom function option in preference).
It is possible to make a union in Google Spreadsheet very easily. For example:
={'Sheet1'!A2:A;'Sheet2'!A2:A;'Sheet3'!A2:A}
See more info in Google Docs Help: Using arrays in Google Sheets
Assuming you have 3 arrays A2:B7, D4:E12, and F2:G230 with the same number of columns but different lengths (often the case if you have the same table of data split into different tabs for each period), I think the easiest way is something like this:
=TRANSPOSE({TRANSPOSE(A2:B7), TRANSPOSE(D4:E12), TRANSPOSE(F2:G230)})
I am trying to create a new reference containing another reference as in ${var${randnum}}.
Ultimately, I want to create a variable which refers to a two times two randomized set of variables.
As the above approach did not work, I developed it further with below result.
In the calculate field I write
concat('$','{','trust',${rand_no2},'_' ,${rand_no3_1},'}')
Which should result in
${trust1_1}
and respective combinations.
Without line 11 (name=ref2) the file compiles and I can start it in ODK Collect (v.2.4) on my phone. When I reach line 10 (in ODK Collect), however, I receive the message:
"Error Occured
Dependency cycle in s; recursion limit exceeded!!"
(I included line 11 to show what I want to do in the end.)
I am writing the file in Excel and compile it with ODK xlsform offline. (For testing I transfer it via cable to my phone.)
The xls file for reproduction can be found here:
https://forum.getodk.org/t/concatenate-references-to-create-new-reference-var-randnum/34968
Thank you very much in advance!
You're mixing up some things related to the ${q} syntax, question names and question values.
Note that ODK Collect does not actually understand the ${q} syntax (which is XLSForm-only). It's helpful to look at the actual form format that ODK collect understands which is called XForm, an XML format that XLSForm converts into. However, even if ODK Collect understood the ${q} syntax, your approach still wouldn't work since you're creating a string value for the ref question (using concat). This wouldn't magically be evaluated as a reference / formula. You cannot dynamically create a reference or formula.
At the moment (until ODK supports something like the local-name() function), maybe the best approach is to use position and put the calculated values inside a group. Something like //group/calc[number(${pos})] perhaps. Note that positions are 1-based (so the first item is position 1) and casting the position to a number or integer is required.
I am trying to create an irregular volume scanner on Thinkorswim using Thinkscript. I want to create an array of volume's in past periods so that I can compare them to the current period's volume (using fold or recursion). However, while the Thinkorswim documentation details what is called an IDataHolder datatype, which is an array of data, I cannot find how one can actually create one, as opposed to just referencing the historical data held by Thinkorswim. Here is the documentation: https://tlc.thinkorswim.com/center/reference/thinkScript/Data-Types/IDataHolder
I have tried coding something as simple as this to initialize an array:
def array = [];
This throws an error. I have tried different types of brackets, changing any possible syntax issues, etc.
Is this possible in the Thinkscript language? If not, are there any workarounds? If not even that, is there a third party programming interface that I could use to pull data from Thinkorswim and get a scanner that way? Thanks for any help.
IDataHolder represents data such as close, open, volume, etc, that is held across multiple bars or ticks. You can reference one of these pre-defined data series, or you can create your own using variables: def openPlus5cents = open + 0.05, say, would be an IDataHolder type value.
There's no way to create an array in the usual programming sense, as you've found, so you'll have to be a little creative. Perhaps, say, you could do the comparison within the fold? volume[1] > volume, or the like? Maybe post another question with an example of the comparison you're trying to do?
I am doing a SPARQL Query that for one variable gives me the output "[-1.6101874126499998e-19]". This is obviously a string containing an array (that could also contain more numbers). Is there a way to access the number in it or does it need to be done in the underlying graph?
If it needs to be changed in the graph, what is a good ontological way to create multi-dimensional arrays...?
xsd:float(SUBSTR(?var,2,STRLEN(?var)-2)) does the job in this case, but it's quite hacky :/
When I append arrays in google spreadsheets, all of the resulting elements are not rendered in cells. For example, if I enter the formula:
={{1,2,3}, {4,5,6}}
the values rendered in spreadsheet cells are 1,4,5,6. Any ideas about why this is happening, or alternatives? My broader problem is to accumulate rows from separate sheets into another sheet - I can do that via
={ImportRange(...), ImportRange(...)}
but the same problem is apparent (missing the second element and beyond from the first array).
Edit (2 Oct 2014)
I just happened upon this when someone upvoted. The information below is obsolete in the newest version of Sheets - you can now (have been able to for a few months) concatenate arrays inside embedded arrays. All the examples that I provided below will work, including the one I said "shouldn't work".
Embedded arrays in Google Sheets
An array of values may be populated by a single function using an embedded array. Each element in the embedded array (and this may be point of conjecture; it is more or less just my opinion) represents the value that will be populated in contiguous cells in the sheet. Semi-colons are row delimiters; commas (or backslashes in locales that use a comma for a decimal separator) are column delimiters. So this will successfully create a two-row, three-column array (all of the following examples assume a locale supporting comma column delimiters):
={1,2,3;4,5,6}
Embedded arrays within embedded arrays
As each element in an embedded array represents a cell in the spreadsheet, I think it is reasonable to assume that one should be able to populate a cell with another embedded array, as long as it does not overwrite other elements in the outer embedded array. So IMO something like this should (see point 3) be successful:
={{1;2;3},{4;5;6}}
However something like this shouldn't work (again IMO), as the second and third elements of the first embedded array would be "overwriting" the second embedded array:
={{1,2,3},{4,5,6}}
There is a bug associated with the first embedded array inside an embedded array
As +Jason pointed out, something like ={{1;2;3},{4;5;6},{7;8;9}} doesn't work in that the first embedded array only populates one element (but every other column is populated correctly). It is also interesting that that one element is auto-converted to a text string. This is (unfortunately) a long standing bug in Google Sheets. The same thing occurs when you attempt to invoke the SPLIT() function on an array (every element in the array is split successfully except for the first one).
I don't think embedded arrays within embedded arrays will help with your broader problem anyway
Embedded arrays can't really be used to append one array on to end of another anyway (due to the "overwriting" effect), and there is no native function that can do it directly. The VMERGE function which you can obtain via the Script gallery (credit to +ahab) will work out of the box:
=VMERGE(ImportRange(...);ImportRange(...);...)
or you can use native functions to do some string manipulation to achieve this. For example, for one-dimensional arrays:
=ArrayFormula(TRANSPOSE(SPLIT(CONCATENATE(ImportRange("key1";"A1:A10")&CHAR(9);ImportRange("key2";"A1:A10")&CHAR(9));CHAR(9))))
but as well as being clunky and not very readable, this type of formula can be very expensive performance-wise for large data sets (I would tend to recommend the VMERGE custom function option in preference).
It is possible to make a union in Google Spreadsheet very easily. For example:
={'Sheet1'!A2:A;'Sheet2'!A2:A;'Sheet3'!A2:A}
See more info in Google Docs Help: Using arrays in Google Sheets
Assuming you have 3 arrays A2:B7, D4:E12, and F2:G230 with the same number of columns but different lengths (often the case if you have the same table of data split into different tabs for each period), I think the easiest way is something like this:
=TRANSPOSE({TRANSPOSE(A2:B7), TRANSPOSE(D4:E12), TRANSPOSE(F2:G230)})