how do you write a conditional struct?

how do you write a conditional struct?

[Walter Roberson]

What is a "conditional struct" ?

Answer 1

[Walter Roberson]

At the beginning start with

data = [];

Then, in each of the error cases, after you disp() the string, add

return

before the "end" of the "if"

if condition
   disp('message')
   return
end

[vishant m.]

Thanks. ;)

Answer 2

[Azzi Abdelmalek]

Maybe you are asking about if/elseif/else

[vishant m.]

i tried using if, but it doesnt work :( can you give a simple example

[Matt J]

@vishant

Why don't you give an example of what doesn't work and describe what you want to happen instead.

[vishant m.]

function data=test3(n)                                 
if  isnumeric(n)==0;                 
  n=([1 2 3 4]); display('input has two many terms or is not a vector'); 
end
if isvector(n)==0;                  
 n=([1 2 3 4]); display('input has two many terms or is not a vectorl');
end
x=linspace(-5,5,1000);             
y=polyval(n,x);                     
plot(x,y);

q=roots(n);                         
data=plot(q(imag(q)==0), zeros(sum(imag(q)==0)),'r+');
data= struct('x',x,'p',n,'rp',q,'rpp',q(imag(q)==0),'px',(x));

end

this is the code, you can see the struct. there are 2 if functions at the start, i need the struct to give ans[] when the condition of any of the ifs applies.

[Azzi Abdelmalek]

[i need the struct to give ans[] when the condition of any of the ifs applies.] I can't understand what you mean