Rewritting to if-statement loop ?

Question

Zaakir Essop 2016-4-27

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https://ww2.mathworks.cn/matlabcentral/answers/281218-rewritting-to-if-statement-loop

回答： Walter Roberson 2016-4-27

采纳的回答： Walter Roberson

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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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Answer 1

Walter Roberson 2016-4-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/281218-rewritting-to-if-statement-loop#answer_219596

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.