Index in position 2 is invalid. Array indices must be positive integers or logical values.

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Varun Lakshmanan 2019-7-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474006-index-in-position-2-is-invalid-array-indices-must-be-positive-integers-or-logical-values

评论： Walter Roberson 2019-7-30

filename.csv

In the third line of code,

csvname = strcat(cpath, "\", cname);
c = csvread(csvname, 1, 0);
raw_data(:,i) = c(1:(min(size(c,1),max_val)),2:size(c,2));

where cpath and cname are the file path and file name of the file, I am getting this error:

Index in position 2 is invalid. Array indices must be positive integers or logical values.

I checked the csv file in question, and it is a valid file (no non-numeric values that are being read). A sample of the file is attached.

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Stephen23 2019-7-30

@Varun Lakshmanan: please show us the complete error message. This means all of the red text. The error message has information that helps understand the problem.

Varun Lakshmanan 2019-7-30

Thanks for your response. I went back and looked at my code again, and realized that the error given is on the third line in the code in my question (I updated my question with the relevant lines of code).

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Answer 1

Walter Roberson 2019-7-30

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Somehow you have managed to assign a value to a variable named csvread and that is interfering with your calling csvread as a function.

Note: if you want to skip the one line header in the file, then you should use 1, 0 instead of 2, 0 . The value is not which row number to start at: it is how many rows to skip, so to start at row 2 then you want to skip 1 row.

You should probably be considering readtable()

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Varun Lakshmanan 2019-7-30

编辑：Varun Lakshmanan 2019-7-30

Thanks for your response. I went back and looked at my code again, and realized that the error given is on the third line in the code in my question (I updated my question with the relevant lines of code).

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Answer 2

Andy 2019-7-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474006-index-in-position-2-is-invalid-array-indices-must-be-positive-integers-or-logical-values#answer_385464

If the 3 lines of code are all you are running, where is i set when you attempt to reference it in line 3?

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Varun Lakshmanan 2019-7-30

I'm running more than 3 lines of code, but this is the necessary code snippet to understand the problem. i should be set in line 3, as I'm not receiving any runtime or compile errors that the use of i is undefined in line 3.