Subplot not combining graphs

16 次查看（过去 30 天）
Lauren Fletcher
Lauren Fletcher 2018-10-4
编辑： Stephen23 2018-10-4
I'm having trouble with the subplot function. I'm working with this code:
filename = 'UnemploymentVacancySeason.xlsx';
num = xlsread(filename);
subplot(1,2,1);
t1=datetime(2000,12,01);
t2=datetime(2015,05,01);
vr=num(:, 3);
ur=num(:, 4);
nn=t1+calmonths(0:173);
figure;
plot(nn, vr, 'r', nn,ur,'b'); xlim ([t1 t2]); datetick('x',12,'keeplimits');
subplot(1,2,2);
urbefore=num(1:80, 4);
vrbefore=num(1:80, 3);
figure;
plot(urbefore, vrbefore, '-o'); xlim ([3 11]); ylim ([1 4])
hold on
urafter=num(81:174, 4);
vrafter=num(81:174, 3);
plot(urafter, vrafter, '-o');
hold off
If I remove the subplots from the code but keep the rest as is, I get these:
But if I keep the subplots in the code, then I get three separate figures that look like this:
How can I fix my code so that I can get the first two graphs side by side?
  2 个评论
Adam
Adam 2018-10-4
You should get into the habit of using the returned handles for graphics objects and passing these explicitly to other instructions e.g.
hFig = figure;
hAxes(1) = subplot( 1, 2, 1, 'Parent', hFig );
plot( hAxes(1),...)
etc. Explicitly telling things where to plot or where to create themselves is a lot easier in the long run than having to work out why things are appearing in odd places when you just give a series of instructions which all just rely on the current figure or current axes being the one you expect it to be.
Stephen23
Stephen23 2018-10-4
编辑：Stephen23 2018-10-4
I agree with Adam: if you want to write reliable code and waste less time chasing down little bugs like this, you should always obtain the handle for every graphics object that you need to refer to or want to change (this means change any property, e.g.: plot new data, move figure, set axes limits, etc.). Using explicit graphics handles is one of those habits that make your own life much easier. Highly recommended.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2018-10-4
The extra figure calls are causing the problem. It creates a new figure, not something you want in the middle of your subplot creation. I commented them out here (just delete them in your code), and it seems to give the result you want:
num = rand(174,4); % Create Data
subplot(1,2,1);
t1=datetime(2000,12,01);
t2=datetime(2015,05,01);
vr=num(:, 3);
ur=num(:, 4);
nn=t1+calmonths(0:173);
% figure;
plot(nn, vr, 'r', nn,ur,'b'); xlim ([t1 t2]); datetick('x',12,'keeplimits');
subplot(1,2,2);
urbefore=num(1:80, 4);
vrbefore=num(1:80, 3);
% figure;
plot(urbefore, vrbefore, '-o'); xlim ([3 11]); ylim ([1 4])
hold on
urafter=num(81:174, 4);
vrafter=num(81:174, 3);
plot(urafter, vrafter, '-o');
hold off
If you want to create a new figure (good programming practise in my opinion), call figure it before your subplot calls:
figure
subplot(2,1,1)
...
subplot(2,1,2)
...

更多回答（1 个）

jonas
jonas 2018-10-4
编辑：jonas 2018-10-4
Do not initate a new figure prior to plotting. A subplot is a single figure with several axes. Simply remove
figure;
and use hold on after
subplot()
if needed
  2 个评论
Adam
Adam 2018-10-4
编辑：Adam 2018-10-4
If you call figure before calling subplot it will (unless something else comes between) put the subplot on that figure.
If you call subplot without creating a figure it will just plonk it on whatever happens to be the current figure, or create a new one if none exist. Which may work perfectly in this case, but is still 'hit and miss'.
jonas
jonas 2018-10-4
Yes, perhaps I wasnt entirely clear. Do not initiate a figure prior to plot but do it prior to creating your first axes by subplot

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Subplots 的更多信息

标签

产品


版本

R2018a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by