MATLAB: Imshow produces error when used in subplot

Question

Hello,

I had a working code using:

figure, imshow(I);

Then I wanted to put all the displayed images into one figure using subplot in this way:

figure;

h = [];

h(1) = subplot(2,4,1); etc.

and calling the image via:

imshow(I,'Parent', h(2))

The problem is that this now produces the error:

"Unable to perform assignment because dot indexing is not supported for variables of this type.

Error in images.internal.basicImageDisplay (line 78)

ax_handle.Colormap = map;

Error in imshow (line 330)

hh = images.internal.basicImageDisplay(fig_handle,ax_handle,…"

Also the image now appears blue and yellow instead of black and white.

Being new to MatLab I can only assume something went wrong with the colormap interfering with multiple images in one figure.

Any help would be appreciated a lot 🙂

Answer 1

From your code, it is not clear how did you assign the 2nd element of vector h. However, I recommend initializing 'h' with 'gobjects'.

Replace

h    = [];

with

h    = gobjects;