![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/181293/image.png)
csv file with a whitespace before comma
7 次查看(过去 30 天)
显示 更早的评论
Hello, I have a CSV file that has a whitespace before comma and when I use csvread it adds more columns of data than it has. For example, following are the contents of the csv file.
11 ,22 ,33
If use csvread the output looks like this
>> csvread('test.csv')
ans =
11 22 33 0 0
Is there any way around this other than removing the white-spaces before csvread call?
Thank you in advance, Bhaskar
2 个评论
per isakson
2015-9-15
编辑:per isakson
2015-9-15
I cannot reproduce your result on R2013a
>> csvread('cssm.csv')
ans =
11 22 33
>> version
ans =
8.1.0.604 (R2013a)
Please, upload your csv-file with the help of the paper-clip-button
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/181293/image.png)
回答(3 个)
Kirby Fears
2015-9-15
I reproduced the error in 2015a. Indeed there are two trailing 0 columns when the csv file contains white space, but no trailing columns after deleting the whitespace.
I recommend using delimread . Download the function, add it to your path, then read your file using:
num = delimread('test.csv', ',' ,'num');
5 个评论
Kirby Fears
2015-9-16
编辑:Kirby Fears
2015-9-16
You can report this as a bug; it may get fixed eventually. The built-in csvread and dlmread functions both have this bug that you've pointed out. They also have very limited functionality, so it may be in your best interest to switch to a new function now instead of putting it off.
I think Mathworks is pushing users to adopt tables and readtable() and therefore have neglected these old csv reading functions. So switching to readtable seems like the smart approach if you're cool with dealing in tables instead of simple arrays.
I made the delimread function (linked above) when I ran into the same problem you're facing now. It reads much more flexible input types but sticks with simple array (or cell) outputs.
Walter Roberson
2015-9-16
csvread() has historically called dlmread() to do the work. dlmread() has historically called textscan() to do its work. textscan() is being actively maintained -- it was, for example, enhanced to handle date formats.
Jae Song
2015-9-15
How about using the offset parameters of the csvread function. For your example:
csvread('test.csv',0,0,[0,0,0,2])
Brendan Hamm
2015-9-15
编辑:Brendan Hamm
2015-9-15
You can also use xlsread or readtable (the latter requires version 2013b or later).
xlsread('test.csv')
readtable('test.csv','ReadVariableNames',false)
2 个评论
Kirby Fears
2015-9-16
It's worth noting that xlsread should not be used on files that are not explicitly excel-formatted files (.xls, .xlsx, .xlsm, etc) since it will fail to read .csv files in non-Windows operating systems. The xlsread function also has way more overhead than simple text reading functions. It is extremely slow for large csv files.
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Large Files and Big Data 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!