Need to use cellfun for returning index of array

Hello

I need to find index for string in structures when compare with required string.

I use the following code

for i=1:numel(LD)

       if strcmp('Lam1',LD(i).Name)
            break;
       end

   end

where i = array index.

Here I will find the index for string residing in LD(:).Names

is their any easy way to find the index using cellfun

I tried like this cellfun(@strcmp,'Lam1',LD(:).Names)

should return the index, correct me I am worng.

[Jan]

You forgot to explain the type of LD.Name: Are they strings or cell strings? And btw., is it LD.Name or LD.Names in plural? I avoid corresponding programming errors by the simple convention:

• All names in singular
• When it matters if a variable is a scalar entity or a list of objects: aMyObject and MyObjectList.

I do not think that this is nicer, but avoiding sources of bugs is more important, especially because useful programs tend to grow.

[Thulasi Durai Durai Samy]

thanks for your nice comments

Answer 1

[Jan]

No need for cellfun or arrayfun:

index = find(strcmp('Lam1', {LD.Name}), 1);

{LD.Name} is efficient, because it creates shared data copies only - this means that the actual strings are not duplicated.

[Thulasi Durai Durai Samy]

ya, it works !! what actually happening in side can you brief me. why to pass 1 as argument for 'find' function.

[Jan]

find(., 1) searchs for the first occurrence only, see help find. On one hand this is a little bit faster, if LD is really large. On the other hand it replicates the behaviour of your function, which breaks after the first occurence also.

Answer 2

[F.]

try this :

   regexp( { LD(:).Name } , 'Lam1' , 'once )

it's to find the first occurance of Lam1 in the cell array { LD(:).Name }

Answer 3

[Walter Roberson]

cellfun(@(S) strcmp('Lam1',S), {LD.Name} )