structure length
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From: Guangping Zhang on 28 Mar 2010 18:43 1X1 structure S contain M1, M2, M3....M30 which has various length, such as 54, 32, 61...42. I write code to get the length of each M. If I write fl(1)=length(S.(fS{1})); fl(2)=length(S.(fS{2})); fl(3)=length(S.(fS{3})); .......... I will get correct length. But if I using for loop below, answer is wrong, all equal 0. fn=fieldnames(S); % all the field name was put into cell fn; n=length(fn); % get fn length; for i=1:n %get each Mi's length; fl(i)=length(S.(fS{i})); end WHo can help me?
From: Walter Roberson on 28 Mar 2010 20:13 Guangping Zhang wrote: > 1X1 structure S contain M1, M2, M3....M30 which has various length, such > as 54, 32, 61...42. > I write code to get the length of each M. If I write > fl(1)=length(S.(fS{1})); > fl(2)=length(S.(fS{2})); > fl(3)=length(S.(fS{3})); > .......... > I will get correct length. > But if I using for loop below, answer is wrong, all equal 0. > > fn=fieldnames(S); % all the field name was put into cell fn; > n=length(fn); % get fn length; > for i=1:n %get each Mi's length; > fl(i)=length(S.(fS{i})); > end > > WHo can help me? In your loop, your reference to fS should be a reference to fn .
From: Guangping Zhang on 28 Mar 2010 23:07 Thank you so much, I fixed it out. Yours, Guangping,
From: Jos (10584) on 29 Mar 2010 03:10 "Guangping Zhang" <zgp480(a)gmail.com> wrote in message <hoom1m$or4$1(a)fred.mathworks.com>... > 1X1 structure S contain M1, M2, M3....M30 which has various length, such as 54, 32, 61...42. > I write code to get the length of each M. > If I write > fl(1)=length(S.(fS{1})); > fl(2)=length(S.(fS{2})); > fl(3)=length(S.(fS{3})); > .......... > I will get correct length. > But if I using for loop below, answer is wrong, all equal 0. > > fn=fieldnames(S); % all the field name was put into cell fn; > n=length(fn); % get fn length; > for i=1:n %get each Mi's length; > fl(i)=length(S.(fS{i})); > end > > WHo can help me? Beside the spelling error (fS instead of fn), take a look at STRUCT2CELL and CELLFUN: fl = cellfun(@length,struct2cell(S)) hth Jos
From: us on 29 Mar 2010 03:24
"Jos (10584) " > Beside the spelling error (fS instead of fn), take a look at STRUCT2CELL and CELLFUN: > > fl = cellfun(@length,struct2cell(S)) > > hth > Jos let alone this critter... help structfun; % eg, r=structfun(@numel,s); us |