How can I export a matrix as a CSV file?
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Hi, I have a 320x2 matrix with doubles. I want to save it in a CSV file in the following pattern: 234,2 671,5 735,1 264,2 346,7 ... etc. I googled this problem and found the function "csvwrite". However, when I use that function like this csvwrite('test.txt',a) I get the following: 234,2671,5735,1264,2346,7 What is going on here? How can I solve this issue? Thanks a lot, Toby
2 个评论
jgg
2016-4-26
Why do you want to export it like that? It seems really unnatural, and will be annoying to accomplish.
Ian Mclennan
2019-7-15
This thread really helped me, thank you for posting.
采纳的回答
MathWorks Support Team
2024-11-14
编辑：MathWorks Support Team
2024-11-14
19 个投票
"csvwrite" is not recommended. Use "writematrix" to export matrix data as a CSV file instead. When writing matrix data to a file, you can specify the file type as part of the file name in the second argument of the function call: m = [234 2;671 5;735 1;264 2;346 7] writematrix(m,'M.csv')
4 个评论
Trevon McHansen
2021-1-29
To potentially save others an extra click or two, "writematrix" was introduced in R2019a.
Larry Gulliver
2022-7-18
Thank you!
Reem
2022-10-5
After I do that, how can I see the csv file?
Chris
2022-11-2
Look at your file hierarchy on the left you'll see a file that's been generated with the name you gave it. You can right click and show it in explorer.
更多回答（4 个）
Azzi Abdelmalek
2016-4-26
a=[234,2
671,5
735,1]
csvwrite('file.csv',a)
4 个评论
Shuva Paul
2019-4-29
Great, thanks for the solution :)
Mehdi BENSEDDIK
2019-5-21
I appreciate you for the sharing
Bill Tubbs
2019-7-13
Being a Python user coming to Matlab I was a bit shocked to find that csvwrite truncates the data output.
csvwrite('u.csv', u)
File contents:
1000,957.6,917,878.13,840.9, ...
Then I happened to check the documentation and found this:
csvwrite is not recommended. Use writematrix instead. For more information, see Compatibility Considerations.
writematrix(u)
File contents:
1000,957.603280698574,917.004043204671,878.12608018665,840.896415253715, ...
Guillaume
2019-7-13
writematrix is fairly new and did not exist when this question was ask.
I was a bit shocked to find that csvwrite truncates the data output.
Any conversion of number to text will truncate the representation of most numbers, in python as well. As documented csvwrite has a precision of 5 digits. For more precision, the alternative at the time was dlmwrite. Interestingly writematrix also doesn't have an option of altering the precision and always use longg (15 digits of precision).
Jos (10584)
2016-4-26
2 个投票
You and your computer disagree on what to use as a decimal symbol: a . or a ,
I strongly recommend you to use a decimal point. Probably that means you have to change your locale / regional settings in the operating system.
Sindar
2019-3-12
It sounds like all you need to do is print a column vector instead of a row vector. This can be done easily:
csvwrite('test.txt',a.')
The '.' is important only if you have complex data
For some reason the example I used was re-edited by the forum software to let it appear in one line. I cannot figure out how to disable that formatting (seriously, WTF??). So here is how I want the CSV file to look as a png file. I hope the forum does not change graphic files.
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