How can I have multiple outputs for a function evaluating various elements?

Hi! I'm new into this. I'm writing a function file and I want to be able to input a vector, evaluate each element with the same function and obtain an output that has each element's result. Here is what I'm writing:

function IF=myfunction(P,T)
a=1.28+15*(1/P+0.05)+exp(100/T)
IF=500+a
display (IF)
end

My inputs are P=[10 20] and T=[30 40] and it has an error saying "error using mrdivide; matrix dimensions must agree".

Answer 1

[madhan ravi]

function IF=myfunction(P,T)
a=1.28+15.*(1./P+0.05)+exp(100./T); %USE ELEMENT-WISE OPERATIONS
IF=500+a;
disp(IF) %not Display it’s disp 
end

[madhan ravi]

did it work?

[Eduardo Chacin]

Thank you very much, it worked. How do I know when to put that dot? Does it only apply to divisions? Or multiplication too?

[Image Analyst]

The 3 lines in this function can all be combined into a single line like I showed in my solution below.

You use dot slash, dot star, or dot caret when you're want element-by-element multiplication of corresponding array elements at the same index. If you don't you're doing matrix operations, like a matrix multiplication that is the sum of rows from one times columns of the second.

[madhan ravi]

@Eduardo Chacin like also sir Image Analyst said in addition read the link below for better understanding element wise operations:

https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

Answer 2

[Image Analyst]

Use dot slash like this:

function IF = myfunction(P, T)
IF = 501.28 + 15 * (1 ./ P + 0.05) + exp(100 ./ T)
end