Thanks for your response. I can summarize my question in the following point. If the program contains matrix work, I need to know the command to write at the beginning of the program to use the results themselves of a part of the program in another part. I mean if the resulted number is 0.0000000001, then it is used without approximating it to 0. So there will not be a problem to use the log function for the elements of the final matrix.

Thank you