Rewritting to if-statement loop ?

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Zaakir Essop
Zaakir Essop 2016-4-27
回答： Walter Roberson 2016-4-27
Hi
I have the following code and was wondering if anyone can help me rewrite it using an if loop
ShearForce = zeros(size(PositionsForce)); %size of shear force matrix
BendingMoment = ShearForce;
for count = 1:1:size(PointLoads,1)
ShearForce = ShearForce + PointLoads(count,1).*(PositionsForce<=PointLoads(count,2)); %ShearForce due to PointLoads
end
for count = 1:1:size(DistributedLoads,1) %ShearForce due to DistributedLoads
ShearForce = ShearForce + DistributedLoads(count,1).*(max(DistributedLoads(count,2:3)) - min(DistributedLoads(count,2:3))).*(PositionsForce<min(DistributedLoads(count,2:3)));
ShearForce = ShearForce + DistributedLoads(count,1).*(max(DistributedLoads(count,2:3)) - PositionsForce).*(and(PositionsForce>=min(DistributedLoads(count,2:3)),PositionsForce<=max(DistributedLoads(count,2:3))));
end
for count = (size(ShearForce,2)-1):-1:1
BendingMoment(1:count) = BendingMoment(1:count) + 0.5.*(PositionsForce(count+1)-PositionsForce(count)).*(ShearForce(count+1)+ShearForce(count));
end
end
Any help would be appreciated.

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采纳的回答

Walter Roberson
Walter Roberson 2016-4-27
MATLAB does not have any "if loop", and I am not aware of any computer language that does.
"for" loops have their body repeated a fixed number of times.
"while" loops repeat their body until a condition becomes false, testing the condition first.
"until" loops repeat their body until a condition becomes true, doing the body once before first testing the condition. MATLAB does not implement "until", but it can be simulated using "while true" and testing the condition at the end with "break" if it is met.
"if" executes the body zero times (if the condition is false) or one time (if the condition is true.) "if" does not loop.

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