MATLab，用函数绘制图形

Question

I'm having trouble writing this code. So, I'm trying to make a code for

func = y*x(n) + z * x(n)

All the values are arbitrary and x(n) is the value at the position n. I need to plot a graph at each nth position. So if x(1) = 5 I plot a point at when x=1 and y=5. The issue is that I can't figure out how to make an arbitrary array and don't know how to get the answer for func when I add x(n) value at the nth position. I also am having trouble plotting a graph, but think this is because I can't figure out to use the array yet.

I'm new to MatLab.

Answer 1

So if I am following y & z are just constants? I think the confusion is typically this would be written something like "y = a x +b x"

Like Cris Luengo mentioned in the comments above, you should should go over some basic Matlab tutorials as this is very basic.

% y and Z are constants
y = 1;
z = 2;
%this makes x = [0,1,2,...10];
x = 0:1:10;
func = y.*x + z.*x;
plot(func)

Answer 2

This should do the trick:

% Define X as a range between -10 to 10 (+1 on every step)...
x = -10:10;

% Define your constants...
y = 3;
z = -1;

% Define the function...
fun = @(x) (y .* x) + (z .* x);

% Plot X on the x-axis and fun(x) on the y-axis...
% fun(x) numerically evaluates fun for the given x
plot(x,fun(x));

Refer to this page for more information about anonymous functions.