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From: Matteo on 15 May 2010 23:29
I am trying to create a character array containing names for some filters using this code:

for i=1:10
names(i,:)=(['filter' char(num2str(i))])
end

I get the result below and also an error message. Can someone help me understand what is happening I do not see why the mismatch? Also, is there an easier way to create the character array as I want it? Thank you so much
nms =

filter1
filter2
filter3
filter4
filter5
filter6
filter7
filter8
filter9

??? Subscripted assignment dimension mismatch.
From: ImageAnalyst on 15 May 2010 23:32
filter10 doesn't have the same number of characters as the prior 9
strings and so it bombs. You'd need a cell array to handle different
sized strings.

for i=1:10
names{i,:}=(['filter' char(num2str(i))])
end

An alternate way to create the strings would be to use sprintf() - I
always prefer that way over the bracket way because it's usually more
compact and flexible/general.

for i=1:10
names{i,:} = sprintf('filter%d', i)
end
From: Matteo on 15 May 2010 23:36
*** Sorry, got the wrong variable names in my original post ***

I am trying to create a character array containing names for some filters using this code:

for i=1:10
names(i,:)=(['filter' char(num2str(i))])
end

I get the result below and also an error message. Can someone help me understand what is happening I do not see why the mismatch? Also, is there an easier way to create the character array as I want it? Thank you so much
names =

filter1
filter2
filter3
filter4
filter5
filter6
filter7
filter8
filter9

??? Subscripted assignment dimension mismatch.
From: Matteo on 15 May 2010 23:37
Awesome - thank you! I have been struggling with these kind of issues forever.

ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <0c8500d9-2763-45df-926f-ae2073024adf(a)v18g2000vbc.googlegroups.com>...
> filter10 doesn't have the same number of characters as the prior 9
> strings and so it bombs. You'd need a cell array to handle different
> sized strings.
>
> for i=1:10
> names{i,:}=(['filter' char(num2str(i))])
> end
>
> An alternate way to create the strings would be to use sprintf() - I
> always prefer that way over the bracket way because it's usually more
> compact and flexible/general.
>
> for i=1:10
> names{i,:} = sprintf('filter%d', i)
> end
From: James Tursa on 16 May 2010 02:24
"Matteo " <matteo.niccoli(a)gmail.com> wrote in message <hsnoq1$da8$1(a)fred.mathworks.com>...
> I am trying to create a character array containing names for some filters using this code:
>
> for i=1:10
> names(i,:)=(['filter' char(num2str(i))])
> end
>
> I get the result below and also an error message. Can someone help me understand what is happening I do not see why the mismatch? Also, is there an easier way to create the character array as I want it? Thank you so much
> nms =
>
> filter1
> filter2
> filter3
> filter4
> filter5
> filter6
> filter7
> filter8
> filter9
>
> ??? Subscripted assignment dimension mismatch.

For the first 9 iterations num2str(i) returns a 1 character string, so the size of the columns of names is the same. But for the 10th iteration num2str(i) returns a 2 character string, so the result of ['filter' char(num2str(i))] will not fit in the names array with its current size. Try pre-allocating the names array so that all of the rows will fit, and then change your assignment to accommodate different sized right hand sides.

James Tursa
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