If loop not executed in a function

Hi everyone,

I'm trying to build a simple function that gives values to parameters based on input. Attached are my programs

In the main program, if I input ship_type='Passenger ship', then everything worked fine

But when I change it to ship_type='cargo ship' or 'container ship', I get the error message 'Matrix dimensions must agree'

So I'm confused.

What's wrong with my program?

Btw, I'm using version 2017a

Answer 1

[KSSV]

Use strcmp instead of equating.

function[A0,A1,A2,A3,A4,A5]=Trial_types(ship_type,x)
 if strcmp(ship_type,'Passenger ship')
  A0=0; 
  A1=1+x;
  A2=2*x;
  A3=3/x;
  A4=4-x;
  A5=x^2;
 elseif strcmp(ship_type,'cargo ship')
  A0=10; 
  A1=10+x;
  A2=20*x;
  A3=30/x;
  A4=40-x;
  A5=(x-10)^2;    
 elseif strcmp(ship_type,'container ship')
  A0=20; 
  A1=20+x;
  A2=30*x;
  A3=40/x;
  A4=50-x;
  A5=(x-20)^2; 
 else
 end
end

[Shuo Zhang]

Thank you very much for your help! It worked perfect!

[KSSV]

You can also use switch. Read about it.