My code
b(abs(b(1:3:length(b))) > 0.75) = 0.75
What it's supposed to do:
b1 = b(1:3:end);
b1(abs(b1)>0.75) = 0.75;
b(1:3:end) = b1;
How are these two not the same?
The indexing part b(1:3:end) returns a short vector of zeros and ones, so will only change the i-th entry of b (for i in the first third-ish of b) to 0.75 if the absolute value of the 3*i + 1-th entry is greater than 0.75.
For example:
b = [-0.684; 0.941; 0.914; -0.029; 0.6; -0.716; -0.156; 0.831; 0.584; 0.919];
b_index = abs(b(1:3:length(b)))>0.75
would return
b_index =
0
0
0
1
and b(b_index) = 0.75 would change the 4th entry of b to 0.75.
One way of doing this as a one-liner is
b(1:3:end) = b(1:3:end).*(abs(b(1:3:end))<=0.75)) + 0.75*((b(1:3:end)>0.75));
but I think the three-liner is a bit clearer.
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