How do I plot an equation that requires I divide over a range?

r = 0.01:0.02;

t = -0.3/r + 398.15

plot(r,t);

%how do I get this to work correctly?

%im trying to plot the equation t over the range of r on a graph

Answer 1

[Star Strider]

There are (at least) two problems:

First:

r = 0.01:0.02;

the default step for the colon,: operator is 1, so the range for ‘r’ is satisfied for the first increment, then stops, so ‘r’ returns a scalar as the first value only.

Second, you need to use element-wise division:

t = -0.3./r + 398.15;
        ↑ ← HERE

to get the vector you want.

With both of these issues fixed, see if:

 r = 0.01:0.001:0.02;
t = -0.3./r + 398.15

plot(r,t)

does what you want.