How to plot two different curves on same axes?

2 次查看（过去 30 天）
PAWAN KUMAR YADAV
编辑： Star Strider 2015-5-1
I have to plot for COD vs TIME. I have discrete values of COD against time and also expression for relationship between COD and TIME. I can plot both the cases differently.
So, how can I merge the two curves of COD and TIME on same axes?

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回答（3 个）

Joseph Cheng
Joseph Cheng 2015-5-1
Yes you can, read the documentation on plot(). There should be sufficient examples showing how to plot plenty of items on one axes.
Azzi Abdelmalek
Azzi Abdelmalek 2015-5-1
plotyy(t,x1,t,x2)
Star Strider
Star Strider 2015-5-1
编辑：Star Strider 2015-5-1
This will do what you want. Adapt it as needed:
TIME = linspace(0, 10, 20);
COD = randi(10, 1, length(TIME));
xmtx = [ones(length(TIME),1) TIME'];
B = xmtx\COD'; % Linear Regression: COD - TIME
COD_fit = xmtx*B; % Fitted Line
figure(1)
plot(TIME, COD, 'bp')
hold on
plot(TIME, COD_fit, '-r')
hold off
grid
xlabel('TIME')
ylabel('COD')
legend('Data','Linear Fit')
axis([xlim 0 11])
It does a linear regression on COD as a function of TIME to create the relationship so it has something to plot, and to demonstrate the technique.
EDIT: Added plot.

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