Find indices in a structure array by comparing the name

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Gerhard Weiss
Gerhard Weiss 2020-12-1
评论： Ameer Hamza 2020-12-2
I have struct array that is similar like that:
Block.name= {'Time','Signal_x','Signal_y','Signal_z'};
Block.channel(1).values= 1:10; %time vetor for all signals in this struct
Block.channel(2).values= rand(1,10); %correspoinding values of Signal_x
Block.channel(3).values= rand(1,10); %correspoinding values of Signal_y
Block.channel(4).values= rand(1,10); %correspoinding values of Signal_z
Now I want to pick out the values of a certain signal, assuming I know the name of the signal but I don't know the order of channels.
Name_desiredSignal= 'Signal_y'; %e.g. values of the Signal_y
I know I can do this by a loop like this:
for idx=2:length(Block.name) %I know that the first channel is always the time vector
if(strcmp(Block.name(idx),Name_desiredSignal))
channel_Nr= idx;
end
Once I have the channel number/index, I can easily get it:
desiredSignal= Block.channel(channel_Nr).values;
I wonder if there is a smarter way, which avoids the loop?
Thanks for help!

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-12-1
That for-loop is same as
channel_Nr = find(contains(Block.name, Name_desiredSignal));

更多回答（1 个）

Gerhard Weiss
Gerhard Weiss 2020-12-2
Unfortunately, I noticed afterwards that my struct array in my real code is different as I wrote above.
Actually it looks like this:
%Block.name= {'Time','Signal_x','Signal_y','Signal_z'}; % wrong simplification
Block.channel(1).name= 'Time';
Block.channel(1).values= 1:10;
Block.channel(2).name= 'Signal_x';
Block.channel(2).values= rand(1,10);
Block.channel(3).name= 'Signal_y';
Block.channel(3).values= rand(1,10);
Block.channel(4).name= 'Signal_z';
Block.channel(4).values= rand(1,10);
Name_desiredSignal= 'Signal_y';
for this struct the suggested solution by Ameer does not work (because the suggested solution was for a different probelm, I know):
channel_Nr = find(contains(Block.channel.name, Name_desiredSignal))
Error using contains (line 52)
Unrecognized parameter name 'Signal_y'. Parameter name must be 'IgnoreCase'.
but a loop works which I would like to avoid:
for idx=2:length(Block.channel)
if(contains(Block.channel(idx).name,Name_desiredSignal))
channel_Nr= idx;
end
end
Any ideas?

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