how would i make this tricky switch case

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nathanial hapeman
nathanial hapeman 2011-10-8
so im making a for loop and inside the for loop i want to have a certain block of code which is either initiated or not. i know i could use a if command but then the computer would have to process that "if" command for how ever many iterations the for loop is. so how would u code the statement below so that a = %{ and b=%} if a certain criteria is asked for?
for i=1:10
a block of code b
end
thanks!!!
  2 个评论
Jan
Jan 2011-10-8
The question is not clear to me. Can you insert a running example? Valid Matlab syntax is understood by more users than the term "a block of code b".
Fangjun Jiang
Fangjun Jiang 2011-11-13
I don't understand the question either!

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采纳的回答

Walter Roberson
Walter Roberson 2011-10-8
MATLAB does not offer pre-processing of that form.
If you do not want the condition executed however many times, put the test a single time in an if statement, and code the section twice, once with and once without the conditional code.
if theCondition
for i=1:10
block of code
second block of code
end
else
for i=1:10
second block of code
end
end

更多回答（2 个）

Harry MacDowel
Harry MacDowel 2011-10-8
help switch
Jan
Jan 2011-10-8
What's wrong with the IF method? It will cost some milliseconds, while writing this question costs a minute.
Perhaps the problem is getting clear, if you post the relevant part of the program and measure the delay caused by the IF, e.g. by inserting the IF twice.

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