Adding vertical line to graph

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ferdaous abderrazak
评论： ferdaous abderrazak 2019-1-3
Hello,
I'm trying to present a vertical line to my graph as you can see below but I don't get the curve of the vetical line

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Cris LaPierre
Cris LaPierre 2019-1-3
编辑：Cris LaPierre 2019-1-3
If you are on the latest version of MATLAB (18b), try using the new xline function.
xline(x1)
Otherwise, what happens if you use the plot function instead of line?
plot([x1 x1],[y0 y1])
  2 个评论
Cris LaPierre
Cris LaPierre 2019-1-3
编辑：Cris LaPierre 2019-1-3
Never mind. I see what you are doing.
You plot your line using frequency(k) for x, but everything else is plotted using frequency(k)/1e9 for x. Your line is being plotted waaaayyyy off to the right.
You also set the limits of your X axis using the axis function to frequency/1e9.
Your lines are there, but you've clipped them off. Try
x1 = x1/1e9;
line([x1 x1],[y0 y1])
or comment out the line of code containing the axis command. This will make it more obvious what is happening.

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更多回答（1 个）

madhan ravi
madhan ravi 2019-1-3
编辑：madhan ravi 2019-1-3
Save the variable in each iteration and plot it outside the loop , you seem to be overwriting them so finally you try to plot a point . Upload your code if you are not able to figure it out.

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