How to draw a heatmap with two numerical variables?

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I was trying to plot a heatmap with two variables, each of which is in a defined range:
And I want to only represent the relationship between a2-a1 and abs(b1b2) in the determinant in the plot.
Screen Shot 2019-11-27 at 17.14.51.png
How should I write my Matlab script?
Thanks in advance.

回答(1 个)

Hritika Suneja
Hritika Suneja 2020-12-29
You can create a table for Xvar, Yvar and Cvar. Here Xvar is the data that will ppear along the x axis. Yvar is the data that will appear along the Y axis and Cvar is used to calculate th color of the data . The default colors are based on a count aggregation, which totals the number of times each pair of x and y values appears together in the table. Once the table is created (let's say tb1) you can create a heatmap using the below command.
>> heatmap(tbl,Xvar,Yvar,'ColorVariable',Cvar)
You can also use the below command :
>> heatmap(xvalues,yvalues,cdata)
Here xdata and ydata are the values appearing along the x-axis and y-axis respectively, specified as a categorical array, string array, numeric array, or cell array of character vectors, and cdata is the matrix specifying color data.
Refer to the following link for more details : https://www.mathworks.com/help/matlab/ref/heatmap.html#bvh0gj7-1-cdata

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