Evaluating Array Values with Different Functions Based On Array Index Value

Question

Nicholas 2015-9-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/243166-evaluating-array-values-with-different-functions-based-on-array-index-value

回答： Jae Song 2015-9-15

I am working on a thin column buckling problem. I have a 1x40 matrix of values (SR) that correspond to a key parameter. If this value is less than 10, Pcr (my end goal) is some constant value. If this value is between 10 and 100, Pcr = SR^2. If SR > 100, Pcr = SR^3. I have the following code

if true
  i=1
for i=1:1:40
  if SR(i)>0 && SR(i)<=10
      Pcr=80,000;
 elseif SR(i)>=10 && SR(i)<=100
      Pcr=SR.^2
  elseif SR(i)>=100
      Pcr=SR.^3
  end
end
end

My desired result is a 1x40 matrix of Pcr with each value as a function of its respective equation.

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Answer 1

Jae Song 2015-9-15

1
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https://ww2.mathworks.cn/matlabcentral/answers/243166-evaluating-array-values-with-different-functions-based-on-array-index-value#answer_192459

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You can put an index for the Pcr variable ( and SR variable as well). Please try the following code.

for i=1:1:40
  if SR(i)>0 && SR(i)<10
      Pcr(i)=80000;
 elseif SR(i)>=10 && SR(i)<100
      Pcr(i)=SR(i).^2;
  elseif SR(i)>=100
      Pcr(i)=SR(i).^3;
  end
end