Histogram or heatmap with self-defined values.

Hello all,

I would like to have a heatmap or histogram 2D (whichever works better) that plots values in the boxes I specify.

Example:

X = [1;2;3];
Y = [10;20;30]; 
mainvalue = [4;76;8];
array = [X,Y,mainvalue];

So if X has the value 2 and Y has the value 20, for example, then mainvalue has the value 76.

Basically I try to change the height of the bins with fixed values from a vector (here mainvalue).

This is how it should look, except that the bins contain the values of mainvalue:

Axis labeling does not match example!

[Adam Danz]

Your 3x1 vectors x, y, and mainvalue are not sufficient for a 2D heatmap or bivariate histogram. In these cases, you would need a 3x3 matrix of mainvalue data so that each pair of (x,y) has a value. What you describe are data along the diagonal but no other values off of the diagonal.

Example:

x = [1 2 3];
y = [5 6 7];
data = rand(3)

data = 3×3

0.6830 0.6347 0.0026 0.8265 0.4307 0.8139 0.5230 0.0823 0.0965

heatmap(x,y,data)

[Lukas Schmid]

Okay that helps!! Thank you Adam.

[Lukas Schmid]

But in that case is there no option how to display the data with a vector like in my example image?

So that each x and y value is also assigned a mainvalue value and I then plot this as a box in the histogram?

[Adam Danz]

I've replied with an answer below.

Answer 1

[Adam Danz]

You have (x,y) coordinates and my interpretation is that you'd like to use color or another property to represent a third value mainvalue. One option is a scatter plot:

X = [1;2;3];
Y = [10;20;30]; 
mainvalue = [4;76;8];

scatter(X,Y,100,mainvalue,'filled'); % 3rd arg defines size
cb = colorbar(); 
ylabel(cb, 'mainvalue')
axis padded
box on 
grid on