How can I change the grid color depending of another value?

Hi!

I need to fill a cell with a color that changes according to a set of values ​​that I have.

For example:

A = [1 2 3 4];

B = [5 6 7 8];

C = [9 10 4 3];

I attached a file with some data test generated from pi.

From the file: A is (:, 1), B is (:, 2), C is(:, 3).

I tried the fill () function and I only get the same color for the whole set of values. Also, I tried with the .FaceColor property

And with the image () function

Best regards

Answer 1

[KALYAN ACHARJYA]

Is this one?

A = [1 2 3 4];
B = [5 6 7 8];
C = [9 10 4 3];
colormap
image([A;B;C]), colorbar

[Roberto Bistel]

Hi!

This is similar to the solution I am looking for.

The y axis is inverted. I change this with: "axis xy"

However:

1-How can I change the values in the colobar scale? Why are the values between 0 to 60? How can I achieve a colorbar with values equal to those of C?

2- How can I change the values on the y axis? On the y axis, I have B = [5 6 7 8]. Then, the values change between 0.5 and 3.5

3- How can I achieve more contrast?

Thanks

[Adam Danz]

1-How can I change the values in the colobar scale? Why are the values between 0 to 60? How can I achieve a colorbar with values equal to those of C?

The values are between 0 and 62 because 62 would be the greatest value if all of Kalyan's data were in 1 box.

% Kalyan's data
A = [1 2 3 4];
B = [5 6 7 8];
C = [9 10 4 3];

sum([A,B,C])
% ans =
%     62

To scale the color range, you need to use imagesc() instead of image().

A = [1 2 3 4];
B = [5 6 7 8];
C = [9 10 4 3];
imagesc([A;B;C])
colorbar()

Now your color bar will be scaled according to the values in A,B,C instead of their sum. If you'd like to manually scale the color range, use caxis().

"2- How can I change the values on the y axis? On the y axis, I have B = [5 6 7 8]. Then, the values change between 0.5 and 3.5"

If you'd like to change the x and y values, set them as inputs to imagesc(). If you want to change the tick marks, set the tick properties. Both are demonstrated below.

h = imagesc([10,20,30,40],[100,200,300],[A;B;C]);
ax = gca(); 
ax.XTick = [10,20,30,40]; 
ax.YTick = [100,200,300]; 

"3- How can I achieve more contrast?"

You can change the colormap (or create your own). Here's a list of matlab's built-in color maps. The demo changes the map from parula (default) to "jet"

A = [1 2 3 4];
B = [5 6 7 8];
C = [9 10 4 3];
imagesc([A;B;C])
colorbar()
colormap('jet')

[Roberto Bistel]

Perfect!

thanks!

[KALYAN ACHARJYA]

Thanks @Adam for explanation