CSVread empty cells non zero

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Hayley Sanders
Hayley Sanders on 19 Mar 2019
Answered: Raghunandan V on 19 Mar 2019
I'm trying to change the default empty cell input for Matlab.
I need to read a csv file and output an array using csvread. I suspect that after it reads and puts it into the array it's already zero so can't read as empty?
function [A] =createanarray(filename, linestoskip)
A=csvread(filename,linestoskip); %read the file and skip the input number of lines
if A(isempty(A))=-999
A(A<0)= NaN; %make no value NaN
A; %output A array
Many thanks!
Jan on 19 Mar 2019
Edited: Jan on 19 Mar 2019
Today I've formatted your code to increase the readability. You can do this by your own in the future.
I cannot guess the purpose of: A(isempty(A))=-999 . This is not a comparison, but an assignment. See the difference between = and == . The statement "A;" is useless also.
csvread does not import empty elements. Please post what your inputs are and what you want as output.
Hayley Sanders
Hayley Sanders on 19 Mar 2019
So for example the file i want to import is an excel csv that is:
2 3 3 4 0
1 2 3 4
0 0 2 3 1
With a blank cell. On assignment of array A with
it changes the blank cell to a zero value. I want to change this to NaN entry.

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Answers (1)

Raghunandan V
Raghunandan V on 19 Mar 2019
Hi, The answer is simple. You try with xlsread
[A, B, C ] = xlsread('Data.xlxs');
Here A gives all the numbers of the matrix.
So if there is a cell with no numbers then it will return NaN. Even if there is a string or emptry cell it still returns NaN.
Try it!




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