Changing the For LOOP conditions
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Jason
el 10 de Oct. de 2019
Comentada: Jason
el 10 de Oct. de 2019
Hello.
I have a for loop that starts with image number 1 and ends with the last image n.
for i=1:n
Sometimes, I only need to analyse every other image- starting at image 2, so would require
for i=2:2:n
I would like to use a checkbox to determine the parameters of the loop.
Rather than write out 2 different loops depending on the value of a checkbox, is there a way where i can just use a single for loop with some condition at the start
i.e.
val=get(handles.checkbox1,'Value)
if val==1
use i=1:n
else
use i=2:2:n
end
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Shubham Gupta
el 10 de Oct. de 2019
Editada: Shubham Gupta
el 10 de Oct. de 2019
One of the way to do this is define the for loop conditions using predefined vectors.
You can write vector to set how the for loop varies. For e.g.
Vec = 1:10
for i = Vec
printf('%d',i)
end
Now, you just need to set Vec according the checkbox :
val=get(handles.checkbox1,'Value')
Vec1 = 1:n;
Vec2 = 2:2:n;
if val==1
Vec = Vec1;
else
Vec = Vec2;
end
for i = Vec
% operation
end
Más respuestas (1)
Stephen23
el 10 de Oct. de 2019
Editada: Stephen23
el 10 de Oct. de 2019
If val has a value either 1 or 2:
for k = 1:val:n
If val is a boolean (i.e. 0 or 1) then simply do either of these:
for k = 1:(1+val):n % true->2, false->1
for k = 1:(2-val):n % true->1, false->2
3 comentarios
Stephen23
el 10 de Oct. de 2019
Editada: Stephen23
el 10 de Oct. de 2019
"But also the starting value needs to be 1 or 2."
That is such a trivially simple change, that I sure that you could have figured that out yourself:
for k = val:val:n
And for the boolean you can also do it quite simply. Using if is a waste of MATLAB, when you can simply set the step size directly. Using intermediate vectors is also pointless.
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