Why this program keep saying Error using plotting>getC Too many output arguments. Error in plotting (line 9) res(i)=getC(1,0,100);? The getC returns c, which is only one output(a number),where're the 'too many' outputs?

Here's my scripts,I'm new to Matlab and really couldn't figure out how to fix this problem...

function plotting
clc 
close all
x = linspace(1,2,2);
res=zeros(1,length(x));
for i=1:length(x)
    xpt=x(i);
    res(i)=getC(1,0,100);
    %res(i)=getC;
end
plot(x,res)

function getC(x,t,n)
c=0;
for k=1:1:n
    c=c+(4*(-1).^k)/((2*k+1)*pi)*cos(((2*k+1)*pi)*x/2)*exp(((-(2*k+1)*pi)/2).^2*t);
end
getC = c;

Answer 1

[Haosong Liu]

if true
function plotting 
clc close all 
x = linspace(1,2,2); 
res=zeros(1,length(x)); 
for i=1:length(x) 
xpt=x(i); 
res(i)=getC(1,0,100); 
%res(i)=getC; end plot(x,res)
if true
function getC(x,t,n) 
c=0; 
for k=1:1:n 
c=c+(4*(-1).^k)/((2*k+1)*pi)*cos(((2*k+1)*pi)*x/2)*exp(((-(2*k+1)*pi)/2).^2*t); 
end 
getC = c;
end

[Haosong Liu]

This is a more reader friendly version of the script I wrote. Thx

Answer 2

[Walter Roberson]

Change

function getC(x,t,n)
c=0;
for k=1:1:n
    c=c+(4*(-1).^k)/((2*k+1)*pi)*cos(((2*k+1)*pi)*x/2)*exp(((-(2*k+1)*pi)/2).^2*t);
end
getC = c;

to

function c = getC(x,t,n)
c=0;
for k=1:1:n
    c=c+(4*(-1).^k)/((2*k+1)*pi)*cos(((2*k+1)*pi)*x/2)*exp(((-(2*k+1)*pi)/2).^2*t);
end