How to set the max and min value of the colorbar to be displayed on a Heatmap on Matlab 2015

Hi, i need something similar. I used HeatMap function ad i obtained the two charts in attachment. The max values for the two charts are 1 an 0.857. On the two charts the maxi values (1 and 0.857) have the same color green. I need to rescale the second chart to the maximum value 1 in order to obtain the same colours for the same values in the two charts.

[KALYAN ACHARJYA]

Scaling~Do you want the same color with the same value in both charts?

[Domenico Lucia]

Exactly. In a presentation i have to compare the two charts and now it is kinda misleading since the max value on the two figures are different but with the same color

[Domenico Lucia]

consider i'm using matlab 2015 where the function is HeatMap. Here below the code:

load('planability_sph.mat')

x = [0.5:0.25:2]; 
y = [-1.75:0.25:1.75]; 

for j = 1:length(x)
    
for i = 1:length(y)
    
    reach_offs(j,i) = reach((j-1)*length(y)+i,4)/100;
    
end
end
format shortG
m = flipud(jet);
map=m(9:32,:);
h = HeatMap(reach_offs,'RowLabels',x,'ColumnLabels',y,'ColumnLabelsRotate',0,'Colormap',map,'Symmetric',false,'LabelsWithMarkers',true,'Annotate',true,'AnnotPrecision',3,'AnnotColor','black');

[Domenico Lucia]

caxis doesn't work with HeatMap

[Adam Danz]

caxis does work with HeatMap (and heatmap).

I just noticed that you're using matlab 2015 after writing my answer. I filled in your version info in the Produce/Release panels to the right; are you using r2015a or b?. In the future, remember that it's very important to provide your matlab release info for clear communication and to save time.

[Domenico Lucia]

thank you for the instruction. Next time i will be more accurate

Answer 1

[Adam Danz]

You're using the older HeatMap from the bioinformatics toolbox.

Instead, use heatmap which supports caxis().

If you have a good reason to continue using HeatMap instead, follow this demo to gain access to the axis handle and apply caxis.

HeatMap(magic(9));
ax = findall(0,'Type','Axes','Tag','HeatMapAxes'); 
caxis(ax, [20,30])

Add a colorbar,

colorbar(ax)

Note other alternatives to heatmap/HeatMap that are supported by older releases of Matlab.

[Domenico Lucia]

Thank you adam, the script works very well with HeatMap

[Adam Danz]

Glad I could help. Note that if more than 1 HeatMap exists the findall command will list all HeatMap axes.