Heatmap plot: how to overlay my cells with values coming from another matrix.

Hello! I am working on a heatmap plot, where I want to overlay my cells with data coming from another matrix (with same size). I have checked the examples available online, however I dont find the way to call the data. I am generaly using the single quotation marks such as: ..., 'colormap', 'jet',..., but cannot find the argument to call the second matrix and fill the cells.

On the other hand, in order to see the values displayed inside each cell I need to zoom in so much that I loose the whole perspective of the graph. Increasing the font size doesnt help... Is there a way instead to scale up the whole graph so the values appear, in order to then save it as a TIF and later on simply minimize its size?

My matlab version is R2018b btw.

Thanks!

[dpb]

I don't follow what you mean by "overlay my cells with data coming from another matrix", sorry.

Think you'll need to show us the code you have and attach data to create sample test case and then illustrate what it is you would like the result to be. You can always draw a sketch if nothing else..