how to find value of x for a known value of y(x), using fplot?

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Nora Khaled
Nora Khaled 2020 年 3 月 12 日
コメント済み: Walter Roberson 2020 年 3 月 15 日
Hi !
I am using the function fplot to plot 5 functions. and the plot is working good.
now for each function I am trying to get the value of the x axis that makes the function equal to a certain value.
my current code is:
syms z(x)
zValues=[0.6250 2.5000 10.0000 15.6250 22.5000];
%plot z(x)
axis([-35 35 -35 35]);
grid on;
and I get this plot:
I want to use the variable zValues to get 5 x values. such that for the blue line z(x) = 0.625 then x= ...
is there a way to do that?
Edit/ Note:
if the function z(x) was only one plot ( say the blue one ) I can use this:
in this case zValues would be be one constant not a vector.
  1 件のコメント
darova 2020 年 3 月 12 日
Do you have polyxpoly? Or intersections



Nora Khaled
Nora Khaled 2020 年 3 月 12 日
The only way I was able to do this is to change z(x).
insted of having all the lines in one plot. I created a loop such that at each eteration z(x) is one line.
then I used
it takes time but I got the results.
  3 件のコメント
Walter Roberson
Walter Roberson 2020 年 3 月 15 日


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