MATLAB: Array indices must be positive integers or logical values

integerlogic

I have a problem to develop my coding. Here is my coding:

Mag=(6.5:0.1:9.5);

beta = bvalue * log(10);

MomentRate = (SM * 1e9)*(A*1e6)*(S/1000); MR=MomentRate;

for i = length(Mag)

N(i) = MR*(1.5-bvalue)*(1-exp(-beta*(M-Mag(i))))/(bv*Mo*exp(-beta(M-Mag(i))));

end

The problem is Array indices must be positive integers or logical values.

Let me how to solve my problem.

Thank you

Muktaf

Best Answer

for i = length(Mag)

doesn't make sense as this will just evaluate to a scalar. I don't see how this would be the source of your error, but it clearly isn't correct. I assume you want

for i = 1:numel(Mag)

Using numel or size with a relevant argument is generally better than using length, but the 1: part is the main change.

As to the error in question, using the debugger is the simplest way to find these.

    beta( M-Mag(i) )

looks like the source of the error though. This will likely not evaluate to an integer to index into beta, though I don't know what M is.

Also, the parenthesis are un-necessary in

Mag=(6.5:0.1:9.5);

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Try this:

filetype = {'SS' 'rev' 'nor'};
figure
hold all
for k1 = 1:numel(filetype)
    for k2 = 1:10
        filedata3 = load(fullfile('D:\Jobs_2019\self\verhor\round3\hikaku_plot', sprintf('momentrate_S%d_%3s.mat', k2, filetype{k1})));
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    end
end
hold off

I obviously cannot test all of it, however I did test the sprintf call, and it works correctly. I added the hold all call to plot all the file data on the same axes.

If you want 30 different plots instead, do this:

filetype = {'SS' 'rev' 'nor'};
for k1 = 1:numel(filetype)
    for k2 = 1:10
        filedata3 = load(fullfile('D:\Jobs_2019\self\verhor\round3\hikaku_plot', sprintf('momentrate_S%d_%3s.mat', k2, filetype{k1})));
        figure
        plot(filedata3.momentrate(:,1), filedata3.momentrate(:,2));
    end
end

Experiment to get the result you want.

Best Answer

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