How can I pass an image to a figure ?

Hello. How can I pass an image to a figure in a MATLAB script?

% Generate a wood grain pattern (example)
grain = rand(300, 400);
grain_thresholded = grain > 0.5; % Creates a binary pattern
% Apply color values to simulate wood grain
image(:,:,1) = grain_thresholded * 0.8 + (1 - grain_thresholded) * 0.4; % Red
image(:,:,2) = grain_thresholded * 0.6 + (1 - grain_thresholded) * 0.2; % Green
image(:,:,3) = grain_thresholded * 0.3 + (1 - grain_thresholded) * 0.1; % Blue
% Display the image
figure;
imshow(image);

The existing figure code is below. I want to replace the brown/tan RGB figure color with the above image color and pattern. Thanks for any help !

% Plot beam cross section
% A = base*h; % beam area, in^2
figure()
pgon = polyshape([0 0 23.5 23.5],[12 0 0 12]);
H = plot(pgon,'FaceColor',[0.666, 0.392, 0.196],'FaceAlpha',0.5);  % use 0.666, 0.392, 0.196
% RGB: (202 164 114) = 0.79 0.643 0.447 wood color
H.LineStyle = '--';
H.EdgeColor = 'black';
hold on
axis equal
grid on
x6 =[0 23.5];
y6 =[6 6];
line(x6,y6,'Color','red','LineStyle','-.') % adds a line at 'c = 6' 
title('Cross Section of Designed Beam')
xlabel('base (in)'); ylabel('height (depth) (in)')

Answer 1

[Adam Danz]

Use image and specify the x and y limits instead of using polyshape.

% Generate a wood grain pattern (example)
grain = rand(300, 400);
grain_thresholded = grain > 0.5; % Creates a binary pattern
% Apply color values to simulate wood grain
I(:,:,1) = grain_thresholded * 0.8 + (1 - grain_thresholded) * 0.4; % Red
I(:,:,2) = grain_thresholded * 0.6 + (1 - grain_thresholded) * 0.2; % Green
I(:,:,3) = grain_thresholded * 0.3 + (1 - grain_thresholded) * 0.1; % Blue


figure()
image([0 23.5], [0 12], I, AlphaData=0.5)

hold on
axis equal padded
grid on
x6 =[0 23.5];
y6 =[6 6];
line(x6,y6,'Color','red','LineStyle','-.') % adds a line at 'c = 6' 
title('Cross Section of Designed Beam')
xlabel('base (in)'); ylabel('height (depth) (in)')

[Doug Leaffer]

Thanks Adam. Your code worked when I passed it to a function wood(b, h, c) -- which are my variables, and called the wood function from a .mlx live script. For some reason the code did not execute without errors if I simply copied it into the live script with no function call.

[Adam Danz]

I just copied it into a live script in R2024b and it ran without any issues. If you continue to have this issue, I recommend contacting tech support. Glad it worked for you otherwise!