calling an array which is initialized inside an if statement + for loop, outside the loop

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KalMandy 2017-1-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320197-calling-an-array-which-is-initialized-inside-an-if-statement-for-loop-outside-the-loop

编辑： Jan 2017-2-9

hi, i have a if statement and it runs a for loop in each case where it is true and false. An array is initialized and assigned a value within this for loop (both cases). Outside the loops, I need both arrays to initialize another array. For example,

for i=1:v
  if z==i
    for j=1:m
      A(j)=x(j)+l;
    end
  else
    for j=1:n
      B(j)=y(j)+l;
    end
  end
  C=A+B;
end

But in my codes, C is only affected by A (if statement is true when i=1). How can I correct this issue?

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Rik 2017-2-9

Is it possible to just move the code to the inside of the for/if thing? If not, you could maybe use a flagging variable, so you can determine where your code has gone and if A should play a role.

Rik 2017-2-9

在 MATLAB Online 中打开

I guess this change doesn't fix your problem?

BTW, I meant something like

if test1==true
  for i=1:m
     A=A+1;
  end
  C=A+B;
else
  C=B;
end

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Answer 1

Jan 2017-2-9

0
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https://ww2.mathworks.cn/matlabcentral/answers/320197-calling-an-array-which-is-initialized-inside-an-if-statement-for-loop-outside-the-loop#answer_254046

编辑：Jan 2017-2-9

在 MATLAB Online 中打开

It is not clear to me, what you want to achieve. But start with simplifying your code:

for i=1:v
  if z==i
    A(1:m) = x(1:m) + l;
  else
    B(1:n) = y(1:n) + l;
  end
  C = A + B;
end

All I see now is this code and your explanation, that you "need both arrays to initialize another array" and "C is only affected by A (if statement is true when i=1)". For a suggestion how to "correct" this, it is required to explain, which behavior you consider as correct.