How to export to workspace a 4D array?

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Mariana 2020-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/526104-how-to-export-to-workspace-a-4d-array

评论： Ameer Hamza 2020-6-4

Basically the first function is generating values between a certain range. This values are indexes in order to have access to certain locations of the 4D array.

When writting mode is active, I save the value of 0.365 to the current location. At the end I would like to export the 4D array to workspace with all the stored values.

The 4D array has the following dimensions: [50 311 91 61] = 86318050 single values

However the array seems to be not able to be exported due to the size. I thought that changing it into single values will help but it seems to be too big.

Any ideas on how to fix this?

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Ameer Hamza 2020-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/526104-how-to-export-to-workspace-a-4d-array#answer_432936

在 MATLAB Online 中打开

Instead of using "To workspace" block, try using assignin(): https://www.mathworks.com/help/releases/R2020a/matlab/ref/assignin.html to directly save the values in the base workspace. For example, write the following line in your function

assignin('base', 'base_variable_name', array_filled)

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Ameer Hamza 2020-5-17

在 MATLAB Online 中打开

Oh! I forgot it does not support code generation. Change the function definition to this

function [[out,array_filled] ]  = fcn(new, input, status, initial_array, export)
coder.extrinsic('assignin') % <===== added this line
%Multidimensional array dimensions
xmin = 0; xmax = 200; xincr = 5;
ymin = -25; ymax = 25; yincr = 5;
zmin = 0; zmax = 180; zincr = 5;
hmin = -10; hmax = 10; hincr = 5;
xvec = xmin : xincr : xmax;
yvec = ymin : yincr : ymax;
zvec = zmin : zincr : zmax;
hvec = hmin : hincr : hmax;
x2xidx = @(xval) round((xval - xmin)/xincr) + 1;
y2yidx = @(yval) round((yval - ymin)/yincr) + 1;
z2zidx = @(zval) round((zval - zmin)/zincr) + 1;
h2hidx = @(hval) round((hval - hmin)/hincr) + 1;
persistent storage
persistent a_new
if isempty(storage)
    storage = initial_array;
    a_new = 0;
end
%(read only)
if status == 1
    a_new = storage(index1,index2,index3,index4);
end
%write only)
if status == 0
    storage(index1,index2,index3,index4);
    a_new = 50; 
end
if export == 1
    multi_array = storage;
else
    multi_array = single(zeros(nx,ny,nz,nh)); 
end
out = a_new;
assignin('base', 'multi_array', array_filled)

Mariana 2020-6-3

I have added the variable of 400MB into the simulink workspace, but I am not able to compile the model. I have an error message that there is no heap space, any suugestion on how to solve this issue?