I have created a function with y as the output and x as input. how do i put statements saying that if x < 0, y = 0; if x > 0, y = 1; if x = 0, y = .5. I have done it trying to do three separate if statements within the same function as shown below.

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Ann Little 2018-11-28

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https://ww2.mathworks.cn/matlabcentral/answers/432455-i-have-created-a-function-with-y-as-the-output-and-x-as-input-how-do-i-put-statements-saying-that-i

评论： Rik 2018-11-28

function [y] = HeavisideFunct(x) 
   y = 0
   if x < 0
       disp(y)
   end 
   y = 1 
   if x > 0 
       disp(y)
   end 
   y = 0.5 
   if x == 0 
       disp(y)
   end 
end 

I was thinking about using 3 different y outputs, but im not sure if that is allowed given that the question being asked doesnt say there is multiple outputs. Does there have to be?

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Rik 2018-11-28

Why do you set your output outside of the if? And why would you use disp?

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Answer 1

KSSV 2018-11-28

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在 MATLAB Online 中打开

function [y] = HeavisideFunct(x) 
   
   if x < 0
       y = 0 ;
       disp(y)
       
   elseif x > 0 
       y = 1  ;
       disp(y)
   elseif x == 0 
       y = 0.5 ;
       disp(y)
   end 
end 

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KSSV 2018-11-28

在 MATLAB Online 中打开

YOu have to save the function on the name, HeavisideFunct.m..go to the folder where it is saved..and call it by:

x = 1.5 ;
y = HeavisideFunct(x) ;

Ann Little 2018-11-28

is that done in the command windown or in the script? Is this where i create another script that displays the factors?

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Answer 2

Stephen23 2018-11-28

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编辑：Stephen23 2018-11-28

The proper MATLAB solution would be to vectorize your code, which efficiently allows for the input to be an array of any size:

>> myheaviside = @(x) 0.5*(x==0) + (x>0);
>> myheaviside([-1,0,1])
ans =
   0.00000   0.50000   1.00000

https://www.mathworks.com/help/matlab/matlab_prog/vectorization.html

https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html

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Ann Little 2018-11-28

Is that placed within the function script? And im still confused as to what the first line is stating?

Rik 2018-11-28

The first line defines an anonymous function. If you don't know what that is, you can follow the second link Stephen posted.

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I have created a function with y as the output and x as input. how do i put statements saying that if x < 0, y = 0; if x > 0, y = 1; if x = 0, y = .5. I have done it trying to do three separate if statements within the same function as shown below.

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I have created a function with y as the output and x as input. how do i put statements saying that if x < 0, y = 0; if x > 0, y = 1; if x = 0, y = .5. I have done it trying to do three separate if statements within the same function as shown below.

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