If you have the histogram object, then you can easily retrieve the required data. For example,
hHist = histfit( rand(100,1), 3, 'normal' )
hHist(1).YData
Here hHist is the histogram object. You can obtain the y values by using hHist(1).YData.
Now the following code can be kept in a MATLAB function block. Let the output of the MATLAB function block be the hHist(1).YData which is fed into a Simulink function block. Once the data reaches a Simulink function block, you can retrieve the data from any of the callbacks present in the various SimEvents blocks.
To understand how to use Simulink function blocks with SimEvents blocks, you can check the following example:
seExampleSchedulerBasic
