hi i want to ask,why matlab cannot process the condition for the while loop ? Thank you!
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clc
clear
close all
%Input data
w=input('Enter the load,w: ');
L=input('Enter the beam length: ');
x=input('Enter specific point: ');
%While loop if false
while (w<1||L<1||x<0||isempty(w)||isempty(L)||isempty(x))
fprintf("\nPlease recheck input data\n")
w=input('Enter the load,w: ');
L=input('Enter the beam length: ');
x=input('Enter specific point: ');
end
%true input data
Ra=w*L;
Ma=-w*L.^2/2;
Mx=-w*(L-x).^2/2;
Sx=w*(L-x);
fprintf("\nThe reaction at A is %.2f\n",Ra)
fprintf("The moment at A is %.2f\n",Ma)
fprintf("The bending moment at point %.f is %.2f\n",x,Mx)
fprintf("The shear force at point %.f is %.2f\n",x,Sx)
2 Comments
Image Analyst
on 10 Jan 2022
Works fine for me. What are your initial inputs before the loop and then what are you entering in the loop?
Answers (1)
Steven Lord
on 10 Jan 2022
Since you're using the short-circuiting or operator you should check the size of the inputs first. Rather than asking if they're empty, ask if they're not a scalar.
%{
while ~isscalar(w) || ~isscalar(L) || ~isscalar(x) || w < 1 || L < 1 || x < 0
%}
That way if (for example) w was not a scalar the ~isscalar(w) check would make the while condition return false before it gets to the w < 1 part (and throws an error.)
w = 0:5;
~isscalar(w) || w < 1 % false, MATLAB doesn't get to the w < 1 check
w < 1 || ~isscalar(w) % error, w < 1 is logical but not scalar
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