How to stop the program and store the scalar variable and rerun the program and plot scalar against scalar

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Meva
Meva 2015-3-4
评论： rantunes 2015-3-4
Hi, I want to plot scalar value (t) against scalar (alpha). But it does not plot.
Simplified code is below:
da = 0.1
for i=1:31;
alpha = (1-1)*da
...
for nt=1:30001;
t=t+dt
...
if (gap2 < 10^(-8)) |(gap2 < 10^(-8))
plot (t,alpha)
break
end
end
Thanks

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rantunes
rantunes 2015-3-4
Hey,
As I can understand from your code, you have alpha = 0, no?
And another thing is that you want to plot each point at each iteration, right? You should try to use the "hold on" command, for the plot function "overwrite" in the first opened plot the next points. Maybe you should save the points in vectors, and plot it outside the external cycle for.
Greets
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Meva
Meva 2015-3-4
Thanks for the answer. I have used alpha in a for loop.
It is supposed to go back and increase the alpha.
In the meantime why did not you use plot command inside if condition.
I need that condition to plot t and alpha and stop the program when
gap1 or gap2 goes to zero and then go back, change new alpha rerun the program
until gap1 or gap2 goes to zero and plot new alpha against t on which we stopped the program.
rantunes
rantunes 2015-3-4
Okay, I understand what do you mean about the plotting, but in any case you have to use "hold on".
In any case, I still don't know how alpha, alpha = (1 - 1)*da, should increase at each iteration.

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