accessing array elements from other function

Question

I have written a matlab function ;now as I simulate it the following error occurs

h(n) = (str.(n));

??? Attempt to reference field of non-structure array.; I could not figure it out . Can any one help ?

function control(varargin)

str =  {
    'violet';
    'indigo';
    'blue';
    'green';
    'yellow';
    'orange';
    'red';
    };

N = length(str);
h = zeros(N,1);
for n =1:N
    h(n) = str.(n);
end

What is the problem with statement h(n)? I want to store str elements in h(n). I also want to pass values to vibgyor from another function. How do I call it from other function?

user1164811 · Accepted Answer · 2012-01-23 12:19:58Z

1

Variable str is not a structure, it is an array of strings. You can convert it as below

str =  {
    'violet';
    'indigo';
    'blue';
    'green';
    'yellow';
    'orange';
    'red';
    };

N = length(str);
h = zeros(N,6);

for n =1:N
    X=cell2mat(str(n));

    for m=1:length(X)
        h(n,m) = X(m);
    end;
end

h

answered Jan 23, 2012 at 12:19

user1164811

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Comments

Aero Engy · Accepted Answer · 2012-01-23 13:28:49Z

1

As stated str is not a structure so to reference the nth element you would just remove the dot on this line:

 h(n) = str(n);

However that would give you this error:

??? The following error occurred converting from cell to double: Error using ==> double Conversion to double from cell is not possible.

That is because you initialized h to zeros and you are trying to make it a cell array. So you should change to the following:

str =  {
    'violet';
    'indigo';
    'blue';
    'green';
    'yellow';
    'orange';
    'red';
    };

N = length(str);
h = cell(N,1);
for n =1:N
    h(n) = str(n);
end

However, if all you are doing is assigning h to str why would you not skip the for loop and just do this

h = str;

edited Jan 23, 2012 at 13:28

answered Jan 23, 2012 at 12:49

Aero Engy

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