Try this —
format short g
A = [0.1, 2, 83, 1000;
0.4, 3, 79, 1001;
0.2, 4, 91, 1018;
0.3, 5, 75, 1095];
B = A(A(:,3)>=70 & A(:,3)<=80,:)
It creates a logical vector to address the appropriate rows, then copies all the respective columns to ‘B’.
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