why am I getting error?

i am trying to write a code without cell2struct function to get female names between age 30 and 40 from following input

>> disp(filterpatients_struct( struct( ...
	'name', {'mary','john','anna','paul','elaina'}, ...
	'gender',{'f',   'm',   'f',   'm',   'f'}, ...
	'age'   ,{25,    35,    30,    22,    38} ) ));

The code i did so far

function [patient] = filterpatients_struct(data)
S = struct;
S.name = strcmp(data(1,:),'name');
S.gender = data(strcmp(data(2,:),'gender'),1);
S.age = data(strcmp(data(3,:),'age'),1);
% Index of females
idx = strcmp(S.gender,'f') ;  
% age criteria
value = S.age(S.age(idx) >=30 & S.age(idx) <= 40 );   

patient = value;

error i am getting

Index in position 1 exceeds array bounds (must not exceed 1).

Error in filterpatients_struct (line 4)
S.gender = data(strcmp(data(2,:),'gender'),1);

Answer 1

[Image Analyst]

Try it this way:

% Demo by Image Analyst.
clc;    % Clear the command window.
fprintf('Beginning to run %s.m ...\n', mfilename);
s = struct( ...
    'name', {'mary','john','anna','paul','elaina'}, ...
    'gender',{'f',   'm',   'f',   'm',   'f'}, ...
    'age'   ,{25,    35,    30,    22,    38} );
filterpatients_struct(s)
fprintf('Done running %s.m\n', mfilename);

function patientNames = filterpatients_struct(data)
allNames = {data.name}
allGenders = {data.gender}
allAges = [data.age]
% Get indexes of females:
femaleIndexes = contains(allGenders, 'f')
% Get indexes where age is between 30 and 40 inclusive:
ageIndexes = (allAges >= 30) & (allAges <= 40)
% Get names where both criteria are true:
bothTrue = ageIndexes & femaleIndexes
patientNames = allNames(bothTrue)
end