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How do I append data to an existing csv file using dlmwrite?

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Lauren
Lauren 2015-6-5
编辑： Stephen23 2015-6-5
Hello! I have a csv that contains historical data. I want to append new data to that file each day so the file stays up to date. I have tried using dlmwrite to do this, but I keep getting the error that I have too many output arguements. Below is my code. Any help would be greatly appreciated!
sp_final = dlmwrite('spx_historical.csv',sp_new,'-append')

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Stephen23
Stephen23 2015-6-5
编辑：Stephen23 2015-6-5
According to the dlmwrite documentation, the function does not have any outputs. So instead of calling this:
sp_final = dlmwrite('spx_historical.csv',sp_new,'-append')
You should call this:
dlmwrite('spx_historical.csv',sp_new,'-append')

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