Undefined function or variable . which is defined in another workspace.

Hello,

I have an problem and I made one code to solve that but I got an error.

Actually I have an function which I want to run in loop so I made function file and then make anouther programme to call that function but "for" loop variable is making error.

My code is somewhat complecated so I write here replica of that for example by which you all can have idea.

My function file code is:

function y=mytest(x)
        y(t)=x(t)+1;
y=y(t);
end

and my programme file code is :

b=1:10;
myfun=@mytest;
for t=1:1:max(b)
    a(t)=myfun(b(t));
end

I am getting thi error:

Undefined function or variable 't'.

Error in mytest (line 2)
        y(t)=x(t)+1;

Error in myrun (line 4)
    a(t)=myfun(x(t));

Please help me or suggest me what to do.

Thank you.

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

http://www.mathworks.com/help/matlab/math/parameterizing-functions.html

[Neel Patel]

thank you .I'm not getting what actually I can use in my code out of these.

Answer 1

[Walter Roberson]

b=1:10;

for t=1:1:max(b)
    myfun = @(x) mytest(x,t);   %<--- parameterized
    a(t)=myfun(b(t));
end

function y=mytest(x,t)         %<--- now receives t as well
   y(t)=x(t)+1;
   y=y(t);
end

This will fail, of course. You are passing the scalar b(t) into mytest, but you are expecting to be able to index it at t.

[Neel Patel]

Thank you.

your given syntax "myfun = @(x) mytest(x,t);" helped me to solve problem.

Answer 2

[Ruger28]

You pass in a value that the function sees as x, but you are trying to use t. You need to pass your b(t) value AND your t value if you need them, but it looks like you just want to add one to your value.

b=1:10;
myfun=@mytest;
for t=1:1:max(b)
    a(t)=myfun(b(t));
end

function y=mytest(x)
        y=x+1;
       % y(t)=x(t)+1;
       % y=y(t);
end

[Neel Patel]

Thank you for answering.

This is example of my code not actual one. my code is complecated so I simply write

 y(t)=x(t)+1;

but actully that is not my real objective.

let me create one more exaple.

if my function is :

 function y=mytest(x)
        y(t)=x(t)+x(t-1)+1;
y=y(t);
end

what now?

I need value of 't'.

Motive of my question is I need that value of 't' in fuction file automatically call value from

for t=1:1:max(b)

[Neel Patel]

If you want then I can give you my whole file but that may be take time to understand my perpose.