How can I convert a string to a function input?

I'd like to convert a string so, that it seems to be an list of arrguments.

x = 1:1:10;
y = 2:2:20;
str = 'x,y';
plot = (function(str));  %should work like: plot(x,y)

I try to do it with the command eval, but I didnt get it work.

x = 1:1:10;
y = 2:2:20;
str = 'x,y';
input = eval(str);
plot(input);

Has someone an idee, how I could solve this problem? Thanks.

Answer 1

[Thorsten]

You can do this

 eval(['plot(' str ')'])

but why do you want to? Using eval often leads to messy code, and there are better solutions. But to give some advice, please tell us what you want to do.

Answer 2

[Simon Kuster]

Thanks for your fast responce. Your solution works perfect.

I wanted to create an input, to plot several lines in one command.

I colleague told me to use 'hold on', so I can use now the normal input for a plot.

figure(1)
plot(x,y);
hold on;
plot(x1,y1);
plot(x2,y2);