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

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Eduardo Chacin
Eduardo Chacin 2018-8-31
编辑： madhan ravi 2018-9-1
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".

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madhan ravi
madhan ravi 2018-8-31
编辑：madhan ravi 2018-8-31
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
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Image Analyst
Image Analyst 2018-8-31
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
madhan ravi 2018-9-1
编辑：madhan ravi 2018-9-1
@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

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更多回答（1 个）

Image Analyst
Image Analyst 2018-8-31
Use dot slash like this:
function IF = myfunction(P, T)
IF = 501.28 + 15 * (1 ./ P + 0.05) + exp(100 ./ T)
end

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