MATLAB: Filtering elements of a cell array and indexing

cellcell arraysfindindexing

Hi,

I have attached a mat file. In the file there are two variables; "groups" and "chan_group_p1".

I would like to obtain a vector with indices of locations of the cell array "groups" on which the content of variable "chan_group_p1" are present.

I tried to do something like followng but it does not work: id= find(groups==chan_group_p1);

My understanding of different kinds of variables in matlab is not so good. Let me know how I should do this task.

Best Answer

idx = find(cellfun(@(x)strcmp(x,chan_group_p1),groups));

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MATLAB: Optimization for two output parameters varying three input variables within given constraints

You have two objectives: minimize delta_p while maximizing delta_T. In general, multiobjective optimization does not have a unique solution, only a set of Pareto optimal points. There is a bit of discussion in this section of the documentation. (Your problem might fit better into the discussion if you think about minimizing both delta_p and -delta_T.)

That said, you can sometimes formulate a problem so that fgoalattain gives you a reasonable solution. See this section of the documentation and this example.

Good luck,

Alan Weiss

MATLAB mathematical toolbox documentation

MATLAB: How to access a structure array using a loop

First, note that with your example, at the end p is a structure with just one field 'p10'. To create the structure you want:

p = struct('p1', {p1}, 'p2', {p2}, 'p3', {p3}, ...)

Also note that you don't need to put the field contents into a cell array, unless this content is itself a cell array. so:

 p = struct('p1', p1, 'p2', p2, ...)

may work just as well.

Secondly, your for loop is not going to work, ['p1' 'p2' 'p3' ...] is exactly the same as 'p1p2p3....', and i will take in turn the values 'p', then '1', then 'p' again, then '2', etc. You need to use a cell array

Finally, to use dynamic field names, you enclose the variable holding the field name in round brackets ().

So:

p = struct('p1',{p1}, 'p2',{p2}, 'p3',{p3}, 'p4',{p4}), 'p5',{p5}, 'p6',{p6}, 'p7',{p7}, 
'p8',{p8}, 'p9',{p9}, 'p10',{p10});
for fn = {'p1', 'p2', 'p3', 'p4', 'p5', 'p6', 'p7', 'p8', 'p9', 'p10'}
%or better: for fn = fieldnames(p)'
   o = p.(fn{1});
end

Best Answer

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MATLAB: Optimization for two output parameters varying three input variables within given constraints

MATLAB: How to access a structure array using a loop

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