Plot function with varying variable

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Joshua Yacoby
Joshua Yacoby 2020-10-19
编辑： Stephen23 2020-10-19
Hello,
I am fairly new to Matlab and having an issue with a script I'm writing. The goal is to plot a few variations of function f on the same graph. The plot will have f on the y axis and z on the x axis. Function f is a function of z and y, and function f itself depends on the value of z. I want to plot for z=1 through 5. Below is what I have so far and I'm having trouble figuring out the problem. Thanks in advance for any help! (My actual functions are a bit more complicated than the example below, but with the solution to this example I should be able to apply)
for z=1:1:5
y=2
if z<=1
f=z*y
elseif z>1
f=2*z*y
end
plot(z,f)
hold on
end

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回答（1 个）

Stephen23
Stephen23 2020-10-19
编辑：Stephen23 2020-10-19
The MATLAB approach is to use logical indexing, e.g.:
z = 0:0.1:5;
y = 2;
f = z*y;
idx = z>1; % logical index
f(idx) = 2*z(idx)*y;
plot(z,f,'-x')

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