How to convert "64x128 single" into "64x128 double"?

Question

Rachel Dawn 2021-5-14

0
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https://ww2.mathworks.cn/matlabcentral/answers/829598-how-to-convert-64x128-single-into-64x128-double

回答： KSSV 2021-5-14

I imported an array from python with this shape: (5, 25, 64, 128, 1) It's 5 sets of 25 images that are 64x128. I tried plotting one of these images on matlab to check if the data imported correctly and it did. this is the code i used to print the image (see below).

nely=64
nelx=128
latent_its(1,1,:,1)
x(1:nely,1:nelx)=latent_its(1,2,:,:)
imagesc(-x); colormap(gray);axis equal; axis tight; axis off;pause(1e-6)

But, for some reason the workspace says that x is a "64x128 SINGLE" vs. "64x128 DOUBLE" (not sure what this means but it should be double, otherwise when I input this x variable into a topology optimization code I needed it for, I get this error (below). When I use a 64x128 double generated in matlab, code works.

Error using  + 
Sparse single array arithmetic operations are not supported.
Error in comp_gen>FE (line 90)
    K(edof,edof) = K(edof,edof) + x(ely,elx)^penal*KE;
Error in comp_gen (line 19)
  [U]=FE(nelx,nely,x,penal);