already know function: find x value given y AND plot (x,y) on the same graph
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Matlab_Student
am 6 Feb. 2016
Kommentiert: Star Strider
am 6 Feb. 2018
Can someone help me with this simple question? I already know the function expression. I would like to find the x value corresponding to y=0.37 and plot the point (x,y) with dash lines connecting to x/y axis in the same graph on top of the line for y?
Here is my current code:
x = 0:100000;
y = exp(-x/38190.7);
figure
semilogy(x,y)
grid on
Thank you!
0 Kommentare
Akzeptierte Antwort
Star Strider
am 6 Feb. 2016
This works:
x = 0:100000;
ofst = 0.37;
y = @(x) exp(-x/38190.7); % Create Anonymous Function
xval = fzero(@(x) y(x)-ofst, 1) % Solve For ‘ofst’ Value
figure(1)
plot(x, y(x))
hold on
plot([xval xval], [0 ofst], '--')
plot([0 xval], [ofst ofst], '--')
plot(xval, ofst, 'bp')
hold off
grid
5 Kommentare
Kalyan Dash
am 6 Feb. 2018
The code works fine. Can you please elaborate the code
plot([xval xval], [min(ylim) ofst], '--')
plot([0 xval], [ofst ofst], '--')
plot(xval, ofst, 'bp')
Star Strider
am 6 Feb. 2018
MATLAB requires two values for the x and two values for y in order to plot the line. It will plot a constant line at a given x or y if both values of either the x or y coordinates are the same value.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Specifying Target for Graphics Output finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!