coding a conditional for loop
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I would like to know what code I need to write a conditional for loop. More specifically, I want to check a list of values to see if they make an equation > a certain number. Then I want to continue using the values that fit the condition in the rest of my code. If they don't fit the condition then I don't want them used. Can anybody help me with this?
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Walter Roberson
2015-11-2
MATLAB does not have conditional for loops. MATLAB does however support code of the form
if some condition
for variable = range
some statement
end
end
and
for variable = range
if some condition
some statement
end
end
The first one checks the condition once and if it is true then runs the entire for loop to completion and otherwise does not run the for loop at all. The second one runs the for loop and for each iteration of the loop tests the condition and if the condition is true executes the statement.
If you wish to exit a for loop early then you can use "break". For example,
for variable = range
t = cos(variable);
if t < -0.88
break
end
some statement
end
This would exit the for loop the first time that cos(variable) < -0.88
2 个评论
Walter Roberson
2015-11-2
What would go in the "statement" position is the using the values" part of "Then I want to continue using the values that fit the condition in the rest of my code"
William Gaillard
2019-3-7
编辑:William Gaillard
2019-3-7
Couldn't you use a while loop to accomplish the same thing
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Walter Roberson
2019-3-9
When I re-read the question, it now looks to me as if the general form should be:
values_to_try = .... something appropriate
y = SomeFunction(values_to_try);
mask = y > a_certain_number;
selected_values = values_to_try(mask);
and then proceed to process selected_values
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