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## Re: Lining up the axes of multiplots/subplots

 From: Matthias Brennwald Subject: Re: Lining up the axes of multiplots/subplots Date: Fri, 17 Nov 2006 17:02:07 +0100

```The following works for me:

-------------------------------------
x1 = [1:0.1:10]; x2 = [3:0.1:15]; y1 = sin(x1); y2 = cos(x2);

xLow = floor(min([x1 x2]));
xHigh = ceil(max([x1 x2]));

subplot(2,1,1);
plot(x1,y1);
axis([xLow xHigh min(y1) max(y1)]);

subplot(2,1,2)
plot(x2,y2);
axis([xLow xHigh min(y2) max(y2)]);
-------------------------------------

```
However, if the labels on the y axes are not of the same width, gnuplot may decide to move the position of the y axes, which will spoil the alignment of the two plots. If so, you will have to resort to using __gnuplot_raw__ . The following example illustrates this:
```
-------------------------------------
x1 = [1:0.1:10]; x2 = [3:0.1:15]; y1 = sin(x1); y2 = 100000*cos(x2);

xLow = floor(min([x1 x2]));
xHigh = ceil(max([x1 x2]));

subplot(2,1,1);
plot(x1,y1);
__gnuplot_raw__("set lmargin 10; \n")
axis([xLow xHigh min(y1) max(y1)]);

subplot(2,1,2)
plot(x2,y2);
__gnuplot_raw__("set lmargin 10; \n")
axis([xLow xHigh min(y2) max(y2)]);
-------------------------------------

HTH,
Matthias

On 17.11.2006, at 14:36, address@hidden wrote:

```
```Message: 7
Date: Fri, 17 Nov 2006 14:35:05 +0100
From: Joseph Wakeling <address@hidden>
Subject: Lining up the axes of multiplots/subplots
Content-Type: text/plain; charset=UTF-8

Hello,

```
I'm hoping someone can give me some advice on multiplot(), subplot() and
```related commands.  I've played around with them a bit but not had
success in achieving what I want.

Here's the aim: two plots, one above the other, sharing the same X
scale.  The X axes must line up together.

I want to plot several data sets in the first plot, and some different
ones in the second.

Now, I can do ...

#first
subplot(2,1,1)
plot(x1,y1)
hold on
plot(x2,y2)
#etc
hold off

#then
subplot(2,1,2)
plot(a1,b1)
hold on
plot(a2,b2)
#etc
hold off

... to get the plots one above the other, but this doesn't do anything
to align the axes.  What commands do I have to use to achieve this?

Two related issues would be (a) the same, but side-by-side and sharing
the same Y scale, and (b) overplotted graphs, where e.g. the X scale is
```
the same but there are two different Y scales on the left and right Y axes.
```
```