my while loop is only running two times then it stops

E=input('Please enter pipe roughness (1.5e-6 and 5.0e-4):'); %check to see if within range while E<1.5e-6 E>5.0e-4 %if not within range display: disp('The number has to be between 1.5e-6 and 5.0e-4') %try again E=input('Please enter a pipe roughness between 1.5e-6 and 5.0e-4:') end

Answer 1

[Image Analyst]

For me it looped and asked everytime I entered a number outside the requested range. Like I entered 1, 3, 9, etc. and it always came back and asked until I entered something like 5e-5. So I can't reproduce your problem.

Answer 2

[blake]

ok, thanks for checking, on my second incorrect input it outputs E=*whatever the input was*, maybe its just my copy of matlab.

[Image Analyst]

It works fine. I just copied and pasted. It's not your copy of MATLAB. Tell me exactly what you typed in.