Increasing Line Thickness Using fplot

Question

Baran Karakus 2017-11-13

评论： Karan Gill 2017-11-13

I want to plot the graph of the function f(x) = e^{-x} - e^{-16x} over the interval [0, 4] and I want the line to be black.

When I run the following code:

f = @(x) (exp(-x) - exp(-16*x));

fplot(f, [0, 4], 'black'),

I obtain the graph I want. However, I want the curve to be thicker on the graph. I have tried to run the following code instead:

f = @(x) (exp(-x) - exp(-16*x));

fplot(f, [0, 4], 'black', 'LineWidth', 2),

but this only gives me errors. I've read the MATLAB documentation for the fplot function but cannot make sense of it.

Answer 1

Star Strider 2017-11-13

You need to use the handle to the line object to set the width:

This works:

f = @(x) (exp(-x) - exp(-16*x));
HL = fplot(f, [0, 4], 'black');
set(HL, 'LineWidth',2)

Karan Gill 2017-11-13

Using dot notation is easier.

f = @(x) (exp(-x) - exp(-16*x));
fh = fplot(f, [0 4], 'black');
fh.LineWidth = 2;

You can also easily set the color

fh.Color = 'green';