Question

anyone good with calc 3 Matlab? please help!! how can i change the scaling on the x-axis? like it usually goes on multiples of 1's. how can i change that? to maybe multiples of 5 or 10?

Answer 1

are you using plot(x,y) ?

Answer 2

no. ezplot

Answer 3

i put >> ezplot(y,[-pi,pi]). so does this mean its already scaled and i just need to relabel the axis into pi and such?

Answer 4

i've never used ezplot; only plot. there might be an "ez" way to do it in options or something

unless you have to use ezplot, i'd recommend doing this way:

this is an example in a script i had to produce:

plot(t,V);
grid on;
xlabel('Time [s]');
ylabel(sprintf('Velocity [Volts]'));
title({'1.5 Turns - Velocity vs. Time'});
xlim([0 .5]) -------- these 2 define the limits of
ylim([-.6 .6]) --------- the window
set(gca,'XTick', 0:.1:2); ---- these 2 define the scaling of
set(gca,'YTick', -.6:.05:.6); --- the axes (gca, '_Tick', lowest: difference between them:highest)

you'll want (gca, 'XTick', 0: use 5 or 10: high end)

Answer 5

thx. the thing is for my case, im making a sine and cos graph and they need to be in multiples of pi.

Answer 6

i'd recommend -pi : pi/4 : pi

Answer 7

or pi/3, depending on your data

Answer 8

whoa. the set(gca command worked. thank you!! :D

Answer 9

mm another question if u don't mind. how do i relabel the numbers in the x axis? so right now it says 3.14 and 1.57 and such and i want to change it to pi and pi/2

Answer 10

only way i know to do this would be manually. so for example:

set(gca,'XTick',-pi:pi/2:pi)
set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'})

we had to manually set all 5 values between -pi and pi

Answer 11

it worked. thank you so much! ^__^

Answer 12

i think adding a backslash will give you the symbol for pi. '-\pi', -\pi/2 ect

otherwise there is an ascii pi symbol you can try copy/pasting

glad i could help :)

Answer 13

wish i could offer u more than a click for 'best response'! >.< you're awesome