MATLAB - adding additional data to surface plot tooltip

I have created a cylinder with the help of a surface plot and a 360x512 matrix with some data(named map100).

When i put my cursor over the cylinder i see my X,Y,Z on the tooltip as expected. However i would also like to see the matrix(map100) value for that point on the tooltip as well. Is this possible ? and if so how?

Any help is much appreciated..

Answer 1

[Walter Roberson]

See https://www.mathworks.com/help/matlab/creating_plots/create-custom-data-tips.html for R2019a and later.

I just confirmed that surf() do have the needed property.

[Ali Shakeri]

i see that but how do i extract the value from the map100 matrix for that point so i can display it?

[Walter Roberson]

row = dataTipTextRow('m100', map100);
cyl.DataTipTemplate.DataTipRows(end+1) = row;

I think.

[Ali Shakeri]

i tried that and i get this error.

Error using matlab.graphics.datatip.DataTipTemplate/set.DataTipRows

{Value must be a string scalar or a character vector with the name of a data property, such as 'XData', or it must be a

vector or a function handle.

Error in createSurfCylinderFinal (line 36)

cyl.DataTipTemplate.DataTipRows(end+1) = row;}

im very confused

[Walter Roberson]

Works for me when I try in R2020b.

z = randi(9, 30, 50);
map100 = sort(z) + randn(size(z));
cyl = surf(z);

row = dataTipTextRow('m100', map100);
cyl.DataTipTemplate.DataTipRows(end+1) = row;

[Ali Shakeri]

this is my map

function heat = getCylinderHeatMap(filename)
    %Returns a struct with info about the file.
    s = dir(filename);
    %Opens a file for reading, hence the 'r'.
    fin = fopen(filename,'r');
    I=fread(fin,s.bytes,'uint8=>uint8');
    
    w = uint16(I(1))+256*uint16(I(2));
    h = uint16(I(3))+256*uint16(I(4));
    skip = s.bytes - w*h + 1;
    IN = I(skip:1:s.bytes);
    Z=single(reshape(IN,w,h));
    Z=griddedInterpolant(Z');
    y_range = linspace(1.0,single(h),360);
    x_range = linspace(1.0,single(w),512);
    heat = uint8(Z({y_range, x_range}));
end

[Ali Shakeri]

its a color map matrix

[Walter Roberson]

I do not have your file or your input matrix to test with, and I posted demonstration code that showed that my approach works.

What is size(map100) ? It looks most likely to be 2D to me, but I cannot prove it from what has been posted.

You could try

row = dataTipTextRow('m100', 'map100');
cyl.DataTipTemplate.DataTipRows(end+1) = row;

[Ali Shakeri]

My workspace that stores all variables says map100 is a 360x512 uint8.

[Walter Roberson]

Did you try my sample code? Did it work for you?