# How to pass an output from a function to be processed in another function

조회 수: 27(최근 30일)
Monty Ramadhan 2014년 10월 31일
댓글: Star Strider 2014년 11월 4일
So i have a function that inputs coordinates and plots a line
function linetranslation(xa,ya,xb,yb)
if nargin == 0
xa = input('First X Coordinate : ');
ya = input('First Y Coordinate : ');
xb = input('Second X Coordinate : ');
yb = input('Second Y Coordinate : ');
end
clf;
hold on;
axis([-10 10 -10 10]);
if xa==xb
if ya<yb
for yi=ya:0.01:yb;
xi=yi+xa-yi;
plot(xi,yi);
end
else
for yi=ya:-0.01:yb;
xi=yi+xa-yi;
plot(xi,yi);
end
end
else
m=(yb-ya)/(xb-xa);
if xa<xb
for xi=xa:0.01:xb;
yi=m*(xi-xa)+ya;
plot(xi,yi);
end
else
for xi=xa:-0.01:xb;
yi=m*(xi-xa)+ya;
plot(xi,yi);
end
end
end
end
the question is how can i pass xi & yi to another function that processes it further
a little idea here, i have tried adding to the first function
function [xi, yi] = linetranslation(xa,ya,xb,yb)
and adding the code below
function Translate(x,y)
>>>here [xi , yi] = linetranslation(xa,ya,xb,yb);
if nargin == 0
% Check the number of input arguments (nargin)
x = input('Translate X: ');
y = input('Translate Y: ');
end
hold on;
axescenter
axis([-10 10 -10 10]);
plot(xi+x,yi+y);
but it returns xa undefined, on the other hand i need xi and yi to be passed
UPDATE
i have tried putting
[xi,yi] = translasigaris;
below
function translate(x,y)
but
if nargin == 0
xa = input('First X Coordinate : ');
ya = input('First Y Coordinate : ');
xb = input('Second X Coordinate : ');
yb = input('Second Y Coordinate : ');
end
returns as an infinite loop.

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### 채택된 답변

Star Strider 2014년 10월 31일
If you want to make ‘xi’ and ‘yi’ available to other functions, the easiest way is to have your ‘linetranslation’ function output them.
Change your original function statement to:
function [xi,yi] = linetranslation(xa,ya,xb,yb)
When you then call it such as in this statement:
[xi,yi] = linetranslation(xa,ya,xb,yb);
‘xi’ and ‘yi’ (by whatever variable names you want to assign them to) will be available in your workspace.
##### 댓글 수: 30표시숨기기 이전 댓글 수: 29
Star Strider 2014년 11월 4일
My pleasure!
If your code does what you want and you’re happy with it, that works for me!

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### 추가 답변(1개)

Abhiram Bhanuprakash 2014년 10월 31일
편집: Abhiram Bhanuprakash 2014년 10월 31일
Hi Monty,
I think one way of solving this would be to use a kind of 'main' function.
You may name it whatever you like, for example, let's say, 'translate_main'.
It can be something like this:
function translate_main(xa,ya,xb,yb)
if nargin == 0
xa = input('First X Coordinate : ');
ya = input('First Y Coordinate : ');
xb = input('Second X Coordinate : ');
yb = input('Second Y Coordinate : ');
end
[xi, yi] = linetranslation(xa,ya,xb,yb);
Translate(xi,yi); % This passes the output of linetranslation as input to Translate
end
And, as you have mentioned, the function linetranslation can be declared as:
function [xi, yi] = linetranslation(xa,ya,xb,yb)
and the function Translate can be declared as:
function Translate(x,y)
From the Command Window, you can call translate_main as:
translate_main(xa,ya,xb,yb);
where xa,ya,xb,yb are defined previously in the MATLAB base workspace.
Hope this helps,
Cheers!
Abhiram.
##### 댓글 수: 1표시숨기기 없음
Monty Ramadhan 2014년 10월 31일
편집: Monty Ramadhan 2014년 10월 31일
hi Abhiram, thanks for the answer, but that's not what i'm looking for. I'm trying to process xi & yi from the second function (Translate) which is a different .m file, i'm sorry i didnt mention this before.

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