Remove Dashed Grey Asymptote Lines From Plot
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I have a plot of a few symbolic functions in matlab, and I'm getting some grey dashed lines. I'm going to guess that these are for asymptotes, which I expected. Is there a way to remove these lines?
Attached is my plot. The lines I'm talking about are at x = 4 and x = 0. Ignore the legend and other colors, that's another story.
3 个评论
Walter Roberson
2020-9-12
is this fplot or fimplicit?
dashed lines for fplot are discontinuities not asymptopes
Benjamin Blood
2020-9-12
mauricio
2022-9-19
is there a way to change their color?
采纳的回答
Walter Roberson
2020-9-12
If you let
h = fplot(expression, range)
then
h.NodeChildren(1).Visible = 'off';
will turn off the discontinuinity lines. (The gray dashed ones, at least. At the moment I do not recall the formula for any functions that generate the brown discontinuity lines. Possibly NodeChildren(2) for those.)
5 个评论
Benjamin Blood
2020-9-17
Walter Roberson
2020-9-18
can you attach your actual code?
Benjamin Blood
2020-9-18
Sure. Here it is. I've changed it a bit since I first asked the question, the new plot is attached. As I've commented in the code, g(1) is the only symbolic function I'm currently trying to plot.
%% Standard Housekeeping
clear all;
close all;
clc;
%% Define objective functions and constraints
syms x1 x2 f1(x1, x2) f2(x1, x2)
% Defining two objective functions
f1(x1, x2) = -0.4 * x1^2 - 4 * x1 - exp(x2^2);
f2(x1, x2) = -(x2 - 5.1/(4*pi^2) * x1^2 + 5/pi * x1 - 6)^2 - 10 * (1 - 1/(8*pi)) * cos(x1) - 10;
% Defining design constraints
g(1) = 2.5 * x1^2 + 0.5 * x1 * x2 - 3; % Only one I'm currently plotting
g(2) = -4 * x1 + 8 * x2^2 - 16;
g(3) = 6 * x1^2 + 2 * x2^2 + 8 * x1 * x2 - 2.5 *x1 - 4 * x2 - 12;
% Defining side cosntraints
x1L = -1.5;
x1U = 2;
x2L = -2;
x2U = 1;
%% Plotting constraints
hold on;
% Plotting g(1)
consPlot = fplot(solve(g(1), x2), [-10 10]);
consPlot.NodeChildren(1).Visible = 'off';
hold off;
And here is the resulting plot:
Walter Roberson
2020-9-18
Put a drawnow() before setting the Visible to off. If you set the visible to off before the drawnow then it will be reset to on when the plot renders.
... No, I do not know why this happens. I could make some guesses.
Oh, look at that, the line comes back again if you resize the plot. I think we can deduce that the rendering callbacks are turning the visibility on. You might want to add in a ResizeFcn callback to drawnow() and turn it invisible again after the axes changes. Or perhaps a PostSet listener on the axes Position property.
Benjamin Blood
2020-9-19
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