Logical Indexing of Cell Array containing matrices

Question

Georg Söllinger 2016-11-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/310990-logical-indexing-of-cell-array-containing-matrices

评论： Walter Roberson 2016-11-8

Hi everyone,

I need help with indexing cell arrays. I have a cell array, which contains matrices in the first, a string in the second and three identifiers in the third-fifth columns (see attached screenshot)

. What I want to do is a plot of specific values, which are located in the matrix of the first column and want to access those values with logical indexing of the identifiers. As a matter of fact, my logical indexing fails, it is not as straight forward as for standard arrays.

See my code below:

plot(R1{(R1{:,3} == phi && R1{:,4} == layer && R1{:,5} == speed),1}(:,6), ...
     R1{(R1{:,3} == phi && R1{:,4} == layer && R1{:,5} == speed),1}(:,3),'Color',color(1,:),'LineStyle','-','LineWidth',1)

I have already tried the solutions with strcmp, but this doesn't work either...

Thanks for your help in advance! Georg

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Georg Söllinger 2016-11-7

Oh sorry, the error message shown in the picture was actually not that, what I wanted to show. Nevertheless, I have no clue, how matlab comes to the error 'abs', if I use the strcmp...

The error, which is thrown with my solution is (when executing R1{:,3} == phi): Error using == Too many input arguments.

As I execute the whole statement, the error message is equal.

KSSV 2016-11-7

Can you attach R1 data and say what is phi and layer?

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Answer 1

Walter Roberson 2016-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/310990-logical-indexing-of-cell-array-containing-matrices#answer_242289

在 MATLAB Online 中打开

mask = cell2mat(R1(:,3)) == phi & cell2mat(R1(:,4) == layer & cell2mat(R1(:,5)) == speed);
subset = R1(mask,:);
plot(subset{1, 1}(:,6), subset{1, 1}(:,3), 'Color', color(1,:), 'LineStyle', '-', 'LineWidth', 1);
hold on
arrayfun(@(ROWIDX) plot(subset{ROWIDX, 1}(:,6), subset{ROWIDX, 1}(:,3), 'Color', color(1,:), 'LineStyle', '-', 'LineWidth', 1), 2:size(subset,1));

If you already have "hold on" in effect then you can use

mask = cell2mat(R1(:,3)) == phi & cell2mat(R1(:,4) == layer & cell2mat(R1(:,5)) == speed);
subset = R1(mask,:);
arrayfun(@(ROWIDX) plot(subset{ROWIDX, 1}(:,6), subset{ROWIDX, 1}(:,3), 'Color', color(1,:), 'LineStyle', '-', 'LineWidth', 1), 1:size(subset,1));