how to apply relational operators on matrix elements?

i=[1 2 3 -4;5 -7 8 9;5 6 7 -7;3 4 -2 4]; i want to replace the elements of above matrix with the value greater than 4 by 4, and the matrix elements less than -4 by -4.

Answer 1

[James Tursa]

i(i>4) = 4;
i(i<-4) = -4;

or

i = min(max(i,-4),4);

But in the future avoid i as a variable name since that is what MATLAB uses for the imaginary number sqrt(-1).