How to Fix "Warning: Colon operands must be real scalars" Warning
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When I run the code below, it works as I wanted, but I get a warning. I tried different things to fix it, but of no avail. How can I refactor my code so that I will not face any related issue as the warning states if I can?
ply_nums_range = [4, 8, 16, 32, 64];
x = rand(1, 2);
data = cartesian_product({b_range, ...
N_xx_range, ...
N_yy_range, ...
N_xy_range, ...
ang_range});
for e = ply_nums_range
ply_nums = e;
for i = 1:length(data)
b = data(i, 1);
N_xx = data(i, 2);
N_yy = data(i, 3);
N_xy = data(i, 4);
ang = data(i, 5);
iteration = [a, ...
b, ...
N_xx, ...
N_yy, ...
N_xy, ...
[PLY_ANGS(ang, x), flip(PLY_ANGS(ang, x))]];
thetas = cell(1, ply_nums);
for j = 1:ply_nums
thetas{j} = sprintf("theta_%d", j);
end
variable_names = ["a", "b", "N_xx", "N_yy", "N_xy", thetas];
table_data = array2table(iteration, ...
'VariableNames', ...
variable_names);
sheet_name = sprintf("%d_ply_case", e);
writetable(table_data, ...
"design-cases/case.xlsx", ...
'WriteMode', 'Append', ...
'Sheet', sheet_name);
end
end
Console output:
Warning: Colon operands must be real scalars. This warning will become an error in a future release.
> In matlab.io.spreadsheet.internal.write.writeXLSFile>getRangeToWrite (line 575)
In matlab.io.spreadsheet.internal.write.writeXLSFile (line 262)
In writetable (line 426)
In test_case (line 72)
3 个评论
Michael Toledano
2024-7-31,18:25
I'm getting the same error for an all-alpha-character command. Is there any fix or workaround available?
回答(5 个)
Jakob Weis
2024-4-23
In my case the warning was triggered because the colon operands were indexed with for-loop indices which I accidentally parsed as a column rather than a row vector.
for_indices = (1:10)'; % Column vector parsed as for-indices triggers warning.
X = 1:10;
Y = 101:110;
for i = for_indices
R = X(i):Y(1);
end
It doesn't look like this is the issue OP is facing but I thought I'd mention it in case somebody else comes across this thread.
0 个评论
VBBV
2024-4-7
for k = 1:numel(ply_nums_range)
ply_nums = ply_nums_range(k); %
for i = 1:length(data)
b = data(i, 1);
N_xx = data(i, 2);
N_yy = data(i, 3);
N_xy = data(i, 4);
ang = data(i, 5);
iteration = [a, ...
b, ...
N_xx, ...
N_yy, ...
N_xy, ...
[PLY_ANGS(ang, x), flip(PLY_ANGS(ang, x))]];
thetas = cell(1, ply_nums);
for j = 1:ply_nums % scalar limit
thetas{j} = sprintf("theta_%d", j);
end
variable_names = ["a", "b", "N_xx", "N_yy", "N_xy", thetas];
table_data = array2table(iteration, ...
'VariableNames', ...
variable_names);
sheet_name = sprintf("%d_ply_case", ply_nums);
writetable(table_data, ...
"design-cases/case.xlsx", ...
'WriteMode', 'Append', ...
'Sheet', sheet_name);
end
end
9 个评论
VBBV
2024-4-8
Though sheetname has no issues, but it may also be the cause, try to give sheetname that begins with character instead of number
sheet_name = sprintf("ply_case_%d", 4)
Steven Lord
2024-4-9
If you have a small case with which you can reproduce this behavior, could you please send it to Technical Support directly using this link? Or could you attach to this Answers post (or send it to Support) a small MAT-file with a representative table_data table array that reproduces this behavior when you run this writetable command? I'd like for us to investigate why writetable is issuing this warning message.
writetable(table_data, ...
"design-cases/case.xlsx", ...
'WriteMode', 'Append', ...
'Sheet', sheet_name);
Nieves
2024-7-25
I'm getting this same error, with both writetable and writematrix. My sheet names have no digits:
writetable(toWrite,fullfile(outDir,specName),'Sheet','Spectral_Data','WriteMode','Append')
writematrix(nemList,fullfile(outDir,specName1),'Sheet','FileNames','WriteMode','Append')
This error has only appeared since updating to R2024a.
0 个评论
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