Number of digits in heatmap plot except for the value 0

I have a 5X5 matrix and want to show the digits up to 3 decimals in the heatmap. However, I don't want to show the digits if the value in the matrix is 0 or almost 0 (like 10^-7). For example, I want to prevent 0 turns int 0.000. How to fix it?

I know you can use the beneath that changes ALL the elements in the matrix, but that is not what I'm looking for.

h.CellLabelFormat = '%.3f'

Answer 1

[Adam Danz]

Replace near-0s with 0

>I want to show them as value ''0'' and not ''0.000'' and for the non-zero values in matrix I want three decimals.

You could replace the near-zeros with 0s where "near zero" is defined by some threashold as shown below. Then show up to 3 significant digits.

% Create data with near-zeros
data = rand(8)*10; 
data(3:5:end) = rand(1,13)*10e-06;

% Replace near-zeros with 0
threshold = 10e-05;
data(abs(data) < threshold) = 0;

% plot results
figure()
h = heatmap(data);
h.CellLabelFormat = '%.3g'; 

Replace near-0s with NaNs

> I don't want to show the digits if the value in the matrix is 0 or almost 0 (like 10^-7)

You could replace the near-zeros with NaNs where "near zero" is defined by some threashold as shown below. Then show 3 decimal places.

% Replace near-zeros with NaN
threshold = 10e-05;
data(abs(data) < threshold) = NaN;

% plot results
figure()
h = heatmap(data);
h.CellLabelFormat = '%.3f';

[S.]

I don't think I was clear enough. I want and need to show the zero or near zero values (due to numerical issues it is not exactly zero), but I want to show them as value ''0'' and not ''0.000'' and for the non-zero values in matrix I want three decimals.

[Adam Danz]

I've updated my answer. The new solution shows 3 significant digits with no trailing zeros ('%.3g'). This isn't exactly what you asked for because it doesn't guarantee that there will be 3 decimal places.