Hi I am trying to read a csv file where the floating numbers have comma as decimal separator. When I read the file with Spark, it will just ignore the comma sign and concatenate everything together and I end up with something like:
77563215,23 becomes 7756321523.00.
How can I make sure that while reading it through spark, I get the same number as my original csv file?
Could you please read CSV file using option("locale", "de-DE")
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I'm currently using Solr to store a few dozen columns of float numbers for later querying and outputting csv files.
I'd like to generate such csv files formatting float numbers to use comma as a decimal separator (e.g. 1.5 should output 1,5), considering such csv files are targeted for a lasting audience.
Is there a way of doing so? I couldn't find any better alternative rather than duplicating such columns as strings, considering I still need the original float values.
I'm generating such files csv by doing:
curl 'https://server/solr/data/select?fl=year%2C%20colA%2C%20colB&q=*%3A*&rows=100&wt=csv' > out.csv
I have a requirement where a .DAT file with data delimited with a HEX code needs to be read in talend.
Below is the sample data -
I have tried tfileinputdelimited, tfileinputpositional, tfileinputraw but nothing worked as expected. The delimiter is a HEX 00x7 or BEL - click here
How can I read this kind of file in talend ?
Your help is appreciated. Thank you in advance.
You can do it by using the utf-8 representation of the character in the field separator: \u0007
We are trying to create a file format using the not character ¬ as the delimiter. We can't get Snowflake to work with a file delimited in this format. The documentation says multibyte delimiters are now supported. We've tried:
Just typing ¬ in the file format dialog
The hex code (permutations of 0xC2AC , 0xC20xAC etc)
The octal code 302 254 entered as permutations of \302254 etc
But whatever we try we get errors. Typing the delimiter straight it seems to think 0xC2 is the delimited and it gets confused by the second byte (0xAC). Using hex code or octal code gives an error about wrong number of columns. Any advice please?
Answer from Sergiu works perfectly:
For octal format use \302\254
So I have to write a C program to read data from .csv files supplied to me by multiple users, into matrices on which I will perform some operations (like matrix addition, multiplication with necessary conditions on dimensions, etc.) and print these matrices (or the output data) in to .csv files again.
I also need to dynamically allocate memory to my matrices.
Now, I have zero background in dealing with .csv files. I do not at all know the required code to read a .csv file or write into a .csv file. I have searched for long on the Internet but surprisingly I have not found any program that teaches how to deal with .csv files from the elementary level.
I am lost on this and need a lot of guidance, maybe a sample, fully well-written C program as I need a comprehensive example to begin with.
A CSV file is just a plain ASCII text file that contains a grid of values. Think of the file as a set of rows in a database table where each line in the file represents one record and the order of the data in each line is identical. Each item of data is separated using a comma character (hence the name). So to read the file:-
open file
until the end of the file
read line into a string
split the string into sub strings where ',' is the dilimiter
parse each sub string
Since there is no formatting information in a CSV file, if the data in each value consists of a string, then what do you do if the value has a comma in it? For reading numbers that is not a problem for you.
You could read the file in several passes, the first to determine the amount of data there is (number of columns, number of rows, etc) and the second to actually read the data.
Writing the CSV is quite simple:-
open file
for each record to write
for each element to write
write element
if not last element
write a comma
write a new line
I wish to read and write to a .csv file using this format: ~83474\t>wed 19 march 2014\n
When reading, I need to ignore the ~, the tab and the >. They are just there to remind my program of what the values that follow are used for. So far I figured out how to write to file using that format, however, I do not know how to read from the file either. I wish to store the numbers after the ~ as an integer value and the characters after the > as a string. How can I read those two values from every line in the file if each line has the format stated above?
Read the whole line as a string using fgets and process it.