MATLAB Central Newsreader - Axes ticks irregular spacing

Axes ticks irregular spacing

dage Tarari — Mon, 29 Jun 2009 11:53:01 -0400

Hi all,

I wonder if it is possible to create X axis ticks with non-monotonically increasing values. Example: if the x-axis represents time and we want to locate one tick for the first day of every month, the spacing will be 28 and 31 between 01 Feb, 01 Mar and 01 Apr, respectively.

Thanks!!
Belen

Re: Axes ticks irregular spacing

Rune Allnor — Mon, 29 Jun 2009 11:56:39 -0400

On 29 Jun, 13:53, "dage Tarari" <ahs...@hjg.es> wrote:
> Hi all,
>
> I wonder if it is possible to create X axis ticks with non-monotonically increasing values.

Of course it is. Try:

set(gca,'xtick',(0:0.2:1).^2)

Rune

Re: Axes ticks irregular spacing

us — Mon, 29 Jun 2009 11:59:03 -0400

"dage Tarari" <ahsghd@hjg.es> wrote in message <h2a9ut$dmc$1@fred.mathworks.com>...
> Hi all,
>
> I wonder if it is possible to create X axis ticks with non-monotonically increasing values. Example: if the x-axis represents time and we want to locate one tick for the first day of every month, the spacing will be 28 and 31 between 01 Feb, 01 Mar and 01 Apr, respectively.
>
> Thanks!!
> Belen

one of the solutions is outlined below

     plot(1:10);
     set(gca,...
          'xtick',[1,2,pi,2*pi,9],...
          'xticklabel',{'1','2','pi','2pi','9Hz'});

us

Re: Axes ticks irregular spacing

Belen — Mon, 29 Jun 2009 12:02:01 -0400

Thank you so much Rune,
Belen

Rune Allnor <allnor@tele.ntnu.no> wrote in message <4c72e071-b1c2-49f6-8a7b-cea8dff43651@y7g2000yqa.googlegroups.com>...
> On 29 Jun, 13:53, "dage Tarari" <ahs...@hjg.es> wrote:
> > Hi all,
> >
> > I wonder if it is possible to create X axis ticks with non-monotonically increasing values.
>
> Of course it is. Try:
>
> set(gca,'xtick',(0:0.2:1).^2)
>
> Rune

Re: Axes ticks irregular spacing

Belen — Mon, 29 Jun 2009 12:14:02 -0400

Excuse me Rune but I still haven't found the way to do the following:
set(gca,'xtick',[0 31 59 90 120 151 181 212 243 273 304 334 365])
0, 31, 28, etc. are julian days.
I'll be very grateful for any advice,
Belen

Rune Allnor <allnor@tele.ntnu.no> wrote in message <4c72e071-b1c2-49f6-8a7b-cea8dff43651@y7g2000yqa.googlegroups.com>...
> On 29 Jun, 13:53, "dage Tarari" <ahs...@hjg.es> wrote:
> > Hi all,
> >
> > I wonder if it is possible to create X axis ticks with non-monotonically increasing values.
>
> Of course it is. Try:
>
> set(gca,'xtick',(0:0.2:1).^2)
>
> Rune

Re: Axes ticks irregular spacing

us — Mon, 29 Jun 2009 12:25:03 -0400

"Belen " <ahsghd@hjg.es> wrote in message <h2ab6a$frb$1@fred.mathworks.com>...
> Excuse me Rune but I still haven't found the way to do the following:
> set(gca,'xtick',[0 31 59 90 120 151 181 212 243 273 304 334 365])
> 0, 31, 28, etc. are julian days.
> I'll be very grateful for any advice,
> Belen

what's wrong with this perfect syntax?
naturally, you have to PLOT/LINE/etc first - or - set the axis's xlim...
otherwise, it does not show up...

plot(1:370);
set(gca,'xtick',[0 31 59 90 120 151 181 212 243 273 304 334 365]);

us

Re: Axes ticks irregular spacing

Steven Lord — Mon, 29 Jun 2009 13:13:46 -0400

"dage Tarari" <ahsghd@hjg.es> wrote in message
news:h2a9ut$dmc$1@fred.mathworks.com...
> Hi all,
>
> I wonder if it is possible to create X axis ticks with non-monotonically
> increasing values. Example: if the x-axis represents time and we want to
> locate one tick for the first day of every month, the spacing will be 28
> and 31 between 01 Feb, 01 Mar and 01 Apr, respectively.

Others have suggested setting the XTick and/or XTickLabel properties, but
from your description I think you may prefer using the DATETICK function in
addition.

x = datenum(2009, 1:12, 1);
y = (1:length(x)).^2;
plot(x, y);
set(gca, 'XTick', x)
datetick('x', 6)

% alternately, if you want all the first days labeled, replace the last line
above with:
datetick('x', 6, 'keepticks')

--
Steve Lord
slord@mathworks.com

Re: Axes ticks irregular spacing

Belen — Mon, 29 Jun 2009 13:19:01 -0400

Thank you very much US!!
Belen

"us " <us@neurol.unizh.ch> wrote in message <h2abqv$9v$1@fred.mathworks.com>...
> "Belen " <ahsghd@hjg.es> wrote in message <h2ab6a$frb$1@fred.mathworks.com>...
> > Excuse me Rune but I still haven't found the way to do the following:
> > set(gca,'xtick',[0 31 59 90 120 151 181 212 243 273 304 334 365])
> > 0, 31, 28, etc. are julian days.
> > I'll be very grateful for any advice,
> > Belen
>
> what's wrong with this perfect syntax?
> naturally, you have to PLOT/LINE/etc first - or - set the axis's xlim...
> otherwise, it does not show up...
>
> plot(1:370);
> set(gca,'xtick',[0 31 59 90 120 151 181 212 243 273 304 334 365]);
>
> us

Re: Axes ticks irregular spacing

Belen — Mon, 29 Jun 2009 13:23:01 -0400

Thank you very much Steven. We are all used to program here in my office, but my none of us knew how to do this simple irregular spacing.
Best whishes,
Belen

"Steven Lord" <slord@mathworks.com> wrote in message <h2aeku$pld$1@fred.mathworks.com>...
>
> "dage Tarari" <ahsghd@hjg.es> wrote in message
> news:h2a9ut$dmc$1@fred.mathworks.com...
> > Hi all,
> >
> > I wonder if it is possible to create X axis ticks with non-monotonically
> > increasing values. Example: if the x-axis represents time and we want to
> > locate one tick for the first day of every month, the spacing will be 28
> > and 31 between 01 Feb, 01 Mar and 01 Apr, respectively.
>
> Others have suggested setting the XTick and/or XTickLabel properties, but
> from your description I think you may prefer using the DATETICK function in
> addition.
>
> x = datenum(2009, 1:12, 1);
> y = (1:length(x)).^2;
> plot(x, y);
> set(gca, 'XTick', x)
> datetick('x', 6)
>
> % alternately, if you want all the first days labeled, replace the last line
> above with:
> datetick('x', 6, 'keepticks')
>
> --
> Steve Lord
> slord@mathworks.com
>