how do i run a loop that extract some file into nested structure

gaitvariable is the structure that i have. Inside that there are more structures called P#. Each P# contains more row vectors. I would like to create a loop that give me the concatanation of the pic's vector, as follow:

t_stride_total=[t_strideP345,t_strideP89....]

I only started the code because I found difficulties with fields of structure

adult_abs=[];
adult_rel=[];
filename = 'gaitvariables_adults.mat';
T = load(filename);
C = struct2cell(T);
folder= C{1}
D= struct2cell(folder);
subfolder= D{1}

[Ameer Hamza]

Can you attach the file gaitvariables_adults.mat?

[matteo bottoni]

Answer 1

[Ameer Hamza]

Try something like this

S.a = [1 2 3]; % example struct
S.P123.t_stride = [4 5 6];
S.P345.t_stride = [3 2 1];
S.P1234.t_stride = [7 6 8];

names = fieldnames(S);
t_stride = cell(1,numel(names));
for i=1:numel(names)
    name = names{i};
    if name(1)=='P'
        t_stride{i} = S.(name).t_stride;
    end
end
t_stride = [t_stride{:}];

[matteo bottoni]

Your code computes empty t_stride, like [ ] [ ] [ ] [ ]

[Ameer Hamza]

Can you attach your data as a .mat file?

[matteo bottoni]

load gaitvariables_adults.mat
names = fieldnames(gaitvariables);
t_stride = cell(1,numel(names));
for i=1:numel(names)
    name = names{i};
    if name(1)=='P'
        t_stride{i} = S.(name).t_stride;
    end
end
t_stride = [t_stride{:}];

and the error is this

Unable to resolve the name S.P431S1.t_stride.

Error in fase3 (line 12)

t_stride{i} = S.(name).t_stride;

[Ameer Hamza]

This line should be

t_stride{i} = gaitvariables.(name).t_stride;

[matteo bottoni]

I'm sorry I've understood only now how does it work, because I forgot the example struct. I deleted it because I've understood wrongly that it works without the calling of all file firslty.

[matteo bottoni]

Thank you so much

[Ameer Hamza]

I am glad to be of help,

[matteo bottoni]

Hi man, what have I to change if I need now not more final concatenation but I want a vector for each patient?

[Ameer Hamza]

Remove this line

t_stride = [t_stride{:}];

It will give you a cell array.

[matteo bottoni]

I need to understand the structure better in some way. Thank you so much Ameer