Referring to the following line:
evalin('base', 'GEN_STATUS(rowIndex, columnIndex) = 456')
The code that runs in "evalin" is using only variables from the base workspace (defined by the first parameter 'base'). However, the variables "rowIndex" and "columnIndex" are only defined in the scope of the "MATLAB Function" block, not the base workspace.
Therefore, the solution to this problem is to save these variables to the base workspace before running the "evalin" line. These variables can be set in the base workspace using "assignin" just before your your call to "evalin" in your 'MATLAB Function' block as follows:
assignin('base', 'rowIndex', rowIndex);
assignin('base', 'columnIndex', columnIndex);
evalin('base', 'GEN_STATUS(rowIndex, columnIndex) = 456');
Please refer to the following documentation pages for more information on "assignin" and "evalin" functions:
