Error using accumarray in for loop with cell array

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Tessa Kol 2020-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/590998-error-using-accumarray-in-for-loop-with-cell-array

评论： Tessa Kol 2020-9-9

I am having trouble with using accumarray in a for loop. Hers is my code so far:

for i = 1:length(files)
    % Define the range of the bins
    rng_x{i} = -0.3:0.06:0.3;
    % Assign the data of x-coordinate to a predefined range
    disc_x{i} = discretize(expData{i,1}(:,1),rng_x{i});
    x_mean{i} = accumarray(disc_x{1,i}(:,1), expData{i,1}(:,1),[11 1], @mean);
end

expData is a 2745x1 cell array and one cell contains a 4757x6 double (see picture)

disc_x is a 1x4757 cell array and one cell contains a 4757x1 double.

When I put in the command window:

x_mean = accumarray(disc_x{1,5}(:,1), expData{5,1}(:,1),[11 1], @mean);

It works fine. But as soon as I am trying to loop over the cells I get error messages. Which is kinda logical since accumarray works down colums. But how can loop over the different cells?

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Tessa Kol 2020-9-9

在 MATLAB Online 中打开

I got the error again. I copied the code but then instead of the x-coordinates I want to do the same thing but then for the z-coordinate:

for i = 1:length(files)
    % Define the range of the bins
    rng_x{i} = -0.3:0.06:0.3;
    % Assign the data of x-coordinate to a predefined range
    disc_x{i} = discretize(expData{i,1}(:,1),rng_x{i});
    x_mean{i} = accumarray(disc_x{1,i}(:,1), expData{i,1}(:,1),[11 1], @mean);
    
    rng_z{i} = 0.3:0.06:0.78;
    % Assign the data of x-coordinate to a predefined range
    disc_z{i} = discretize(expData{i,1}(:,3),rng_z{i});
    z_mean{i} = accumarray(disc_z{1,i}(:,1), expData{i,1}(:,3),[8 1], @mean);
    
    
end
Error using accumarray
First input SUBS must contain positive integer subscripts.
Error in SiloV1_results_single (line 74)
    z_mean{i} = accumarray(disc_z{1,i}(:,1), expData{i,1}(:,3),[8 1], @mean);
    
    

Tessa Kol 2020-9-9

I found what was wrong. In my data file of z-coordinates I had values outside the defined range. This gave me an NaN, which accumarray couldn't interpret of course.

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