Can I use a for loop in the condition statement of an if branch??

I am trying to pick selected values of out one array and assign them to a new array. The condition for this 'picking' needs to have a for loop. I mean, the condition must be repeated for a given number of times. So, can I use a 'for' loop in the condition statement of the 'if'?? I have tried the other way round, where the 'if' comes inside 'for' and I have obtained erroneous results. If I am not allowed to do the above, kindly direct me as to how I could solve such an issue.

Answer 1

[Simon]

Can you give an example? As far as I understand you have some values in your array that must match some condition. You may write this without loops like

if (samplearray([1 4 6]) == [1 2 3])
...
end

[Teja Jupudi]

No it's like this: I have a master array with say n elements, that belong to two categories. I have one more array specifying the POSITION of the 2nd category elements in the master array. I was successful in picking this 2nd category elements and placing them in a new array. I've not been able to do the same with the first category.

Maybe the logic I'm applying is flawed. I need to know if that's the case too. Thanks!

[Teja Jupudi]

I am sorry, I also have to tell you this:

I need the master array unaltered, value-wise and sequence wise. The values of the master array MAY be repeated. Values in the master array belonging to different categories may have the same value. So the only criteria to pick elements is to use the second array as a map.

[Simon]

Hi!

Just use a logical variable like

ConditionMet = true
for n = 1:NumberOfConditions
  % check current condition
  if ~(...)
    ConditionMet = false
  end
end

% now your if
if ConditionMet
  ...
else
  ...
end

Answer 2

[David Sanchez]

No, you can not use a for-loop as the condition of an if statement as in the following WRONG code:

if (for k=1:3 k=k end)
    disp('correct expression');
end

In case your if-statement needs more than one condition to be fulfilled, you have to use && to add them up.

if (1==1 && 2==2 && 3==3)
    disp('correct expression');
end

[Teja Jupudi]

I realized that. But the deal is, I need to verify the '&&' condition with an unknown number of values available only during run-time. Also the comparison of the condition variable is to be done with values that are obtained at run time.

If there is any other way to achieve said outcome, kindly share. Thanks!!

[David Sanchez]

Sorry for the misunderstanding, can you provide some pseudo-code of what you need? I'm pretty sure you can do what you want but some code/pseudo-code would be of great help in order to give a more precise answer.