What's going on when setting these parameters?

So my question is quite simple.

I'm plotting, for example:

x=[0:0.1:4] 

x = 1×41

0 0.1000 0.2000 0.3000 0.4000 0.5000 0.6000 0.7000 0.8000 0.9000 1.0000 1.1000 1.2000 1.3000 1.4000 1.5000 1.6000 1.7000 1.8000 1.9000 2.0000 2.1000 2.2000 2.3000 2.4000 2.5000 2.6000 2.7000 2.8000 2.9000

plot(x, sqrt(x), 'b.-')
title('Square root')
grid on

From trial & error I see that the numbers 0, 4 are my x-axis parameters, i.e. I'm printing the function for XE[0,5].

What exactly is the 0.1 for? What's that number doing? What's its purpose?

Thanks!

Answer 1

[Les Beckham]

That sets the increment for the x vector.

Read the documentation for the colon operator: colon

Answer 2

[Image Analyst]

It's the step distance from one x value to the next. Look at your x values:

x = 0 0.1000 0.2000 0.3000 0.4000

See, they're 0.1 apart.