replace cell content of excel from matlab script

i have an excel sheet of data having (400x256). The columnsn of each row B,D, F, F+2, F+4,..... till 256 having value either 80 or 90. i want to replace those values with "pass" or "fail".

I am using matlab 2018a. so i am using xlsread/xlswrite funtions.

I tried the below code but it is not working...

I read the excel to a variable in matlab

data = xlsread("filename.xlsx","sheet").

then tried changing that particular cell,

        if data(1,2) == 80
            data(1,2) = "pass"
       end

then write back the data to excel.

       xlswrite("filename.xlsx", data, "sheet")

but i don't see "pass" in B1 cell instead seeing an empty cell.

Answer 1

[Mathieu NOE]

hello

this is my suggestion - convert your data (numeric double) to cell array first

and more robust if statement as numerical round off can cause some issues it you do "strict" comparison with the given value (here 80), so use a tolerance to account for this

data = xlsread('filename.xlsx','sheet');
cellarray = num2cell(data);

tol = 1e-12;

% then tried changing  that particular cell,
        if abs(cellarray{1,2} - 80) < tol
            cellarray{1,2} = "pass"
       end
% then write back the data to excel.
       xlswrite('filename.xlsx', cellarray, 'sheet')

[Deepan Muthusamy]

this works for me. thank you @Mathieu NOE

[Mathieu NOE]

My pleasure

Answer 2

[Günter Gsellmann]

You should use readtable instead of xlsread => https://de.mathworks.com/help/matlab/ref/readtable.html?s_tid=srchtitle

In your case you are creating a NaN, as your "data" is only numeric.