plotting with changing variable values with switch case command

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Meva
Meva 2015-3-3
评论： Robert Cumming 2015-3-3
My whole program run with a loop . It is not showing the plot when I try below:
for nt =1:30001
...
switch nt
case 0
h1=plot(x,y,x,z,'-.xr');
case 10001
h2=plot(x,y,x,z,'-.xg');
case 20001
h3=plot(x,y,x,z,'-.xk');
case 22556
h4=plot(x,y,x,z,'-.xb');
end
hold on;
legend('1','2','3','4')
How can I plot all cases?

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回答（1 个）

Robert Cumming
Robert Cumming 2015-3-3
you need to specify the hold command before you start creating the plots.
  2 个评论
Meva
Meva 2015-3-3
编辑：Meva 2015-3-3
I have added
plot(h1,h2,h3,h4)
I used :
switch nt
case 0
h1=plot(x,y,x,z,'-.xr');
case 10001
h2=plot(x,y,x,z,'-.xg');
case 20001
h3=plot(x,y,x,z,'-.xk');
case 22556
h4=plot(x,y,x,z,'-.xb');
end
hold on;
plot(h1,h2,h3,h4)
legend('1','2','3','4')
but it does not recognise h1
Robert Cumming
Robert Cumming 2015-3-3
your loop starts at 1 - h1 is only activated when your loop index is 0 (doesn't look like that happens in your example)

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