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may95
0

How do I plot a certain interval?

may95
さんによって質問されました 2019 年 3 月 23 日
最新アクティビティ Star Strider
さんによって コメントされました 2019 年 3 月 23 日
Hi guys,
So I'm trying to plot an interval between [8 12], but I don't know where to start, as I'm not using x-values in my function.
So this is the idea:
34522.JPG
And this is my script:
for N = 8;
Mc = [-2:0.01:15]*N;
Pi_c = 1+(2*N-1)*(3-2*Mc/N).*(Mc/N).^2;
end
plot(Mc,Pi_c,'k')
axis([-4 13 1 17])
xlabel('m_c')
ylabel('pressure ratio')
title('Simplified compressor characteristic')
Any help would be greatly appreciated!

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2 件の回答

Star Strider
回答者: Star Strider
2019 年 3 月 23 日
 採用された回答

This will overplot the region (8,12) with a red dashed line:
for N = 8;
Mc = [-2:0.01:15]*N;
Pi_c = 1+(2*N-1)*(3-2*Mc/N).*(Mc/N).^2;
end
plot(Mc,Pi_c,'k')
hold on
McIdx = (Mc >= 8) & (Mc <= 12); % Select Elements (Logical Vector)
plot(Mc(McIdx), Pi_c(McIdx), '--r') % Plot Range
hold off
axis([-4 13 1 17])
xlabel('m_c')
ylabel('pressure ratio')
title('Simplified compressor characteristic')
Experiment to get the result you want.

  2 件のコメント

may95
2019 年 3 月 23 日
OMG you are amazing! Thank you so much!
Star Strider
2019 年 3 月 23 日
As always, my pleasure!

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John D'Errico
回答者: John D'Errico
2019 年 3 月 23 日

I'm confused. That you are not using x-values does not seem relevant. You plotted Mc on the horizontal axis.
Next, the line:
for N = 8
Does not create a loop. Well, it does, but the loop has length only one step, at N=8. All it does is assign the value of 8 to N.
Next, you want Mc to lie between 8 and 12.
N = 8;
Mc = linspace(8,12,100);
Pi_c = 1+(2*N-1)*(3-2*Mc/N).*(Mc/N).^2;
plot(Mc,Pi_c)
untitled.jpg
Which is only the region you seem to be interested in. We can even add some white space on the axes, to show you that indeed, only the part of interest was created.
axis([-4,13,0,17])
untitled.jpg

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may95
2019 年 3 月 23 日
Hi John, thank you very much for the explanation!

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