MATLAB: How to change the line width for fplot

figureMATLAB

Hello All,

I want to make lines in graph thicker. Here is my code, but it seems not working.

clear all;
close all
clc;
w1=0;
w2=16.73;
x1= @(t) 0.05*cos(w1.*t)-0.05*cos(w2.*t);
x2= @(t) 0.05*cos(w1.*t)+0.05*cos(w2.*t);
graph1 = plot(figure1);
set(graph1,'LineWidth',2);
fplot(x1,[0,2],'k');
hold on;
fplot(x2,[0,2],'--k');
hold off;
legend('x','y');
title('plot');
xlabel('t');
ylabel('d');

I am increasing the linewidth, but messing up somewhere. In plot command, you can straightaway write 'LineWidth' in plot() itself, but no so in fplot. Any comments where I messed up?

Best Answer

Starting in R2016a, you can specify the 'LineWidth' property the same way you do for plot. For example:

>> fplot(x1,[0,2],'k','LineWidth',2);

In R2015b and earlier releases, you have to search for the object and set the line width. To set the widths of all the lines to 2:

>> set(findall(gca, 'Type', 'Line'),'LineWidth',2);

Or, to set the width of one line:

>> set(findobj(gca, 'Type', 'Line', 'Linestyle', '--'), 'LineWidth', 2);

Related Solutions

MATLAB: How can i clear a plot that drawn in a subplot

Use cla() instead of clf() and clear the axes instead of deleting the curve.

h1 = subplot(2,1,1);
hold on
x1=(0:0.01:10);
y1=sin(x1);
p1=plot(x1,y1);
h2 = subplot(2,1,2)
hold on
x1=(0:0.01:10);
y2=sin(x1)+cos(x1);
p2=plot(x1,y2,'Color','r');
cla(h2)
cla(h1)

MATLAB: Plot all four functions

It only plots the first one because your Zeta is always 1 (c/cc = 1). Moreover, even if you changed Zeta to be other values, it would overwrite your graph since you do not have "hold on" for the figure.

instead of using if statements, why dont you define 4 different functions like this:

clear,clc
%% Givens
m=2; %kg
k=200; %N/m
x0=0.05; %meters
x_dot=2; %m/s
%% Solution Part A
Wn= (k/m)^0.5;
c= (2*m*Wn);
Cc= (2*m*Wn);
%% Solution Part B
Zeta=1;
C1=x0;
C2=x_dot+Wn*x0;
x_1 =  @(t) (C1+C2*t)*exp(-Wn*t);
Zeta=0;
X= (((x0^2)*(Wn^2)+(x_dot^2)+(2*x0*x_dot*Zeta*Wn))^0.5)/(((1-(Zeta^2))^0.5)*Wn);
phi= atan((x_dot+(Zeta*Wn*x0))/(x0*Wn*((1-(Zeta^2))^0.5)));
Wd= ((1-(Zeta^2))^0.5)*Wn;
x_0 = @(t) X*(exp(-Zeta*Wn*t))* cos((Wd*t)-phi);
Zeta=0.5;
X= (((x0^2)*(Wn^2)+(x_dot^2)+(2*x0*x_dot*Zeta*Wn))^0.5)/(((1-(Zeta^2))^0.5)*Wn);
phi= atan((x_dot+(Zeta*Wn*x0))/(x0*Wn*((1-(Zeta^2))^0.5)));
Wd= ((1-(Zeta^2))^0.5)*Wn;
x_05 = @(t) X*(exp(-Zeta*Wn*t))* cos((Wd*t)-phi);
Zeta = 2;
C1=x0;
C2=x_dot+Wn*x0;
x_2= @(t) C1*exp(-Zeta+sqrt(Zeta^2-1)*Wn*t)+C2*exp(-Zeta-sqrt(Zeta^2-1)*Wn*t);
figure(1)
fplot(x_0,[0 1],'b')
hold on
fplot(x_05,[0 1],'r')
fplot(x_1,[0 1],'g')
fplot(x_2,[0 1],'k')
hold off
legend('Zeta = 0','Zeta = 0.5','Zeta = 1','Zeta = 2')
axis([0 1 -0.5 0.5])
%% Solution Part C

This way you can plot them all.

Best Answer

Related Solutions

MATLAB: How can i clear a plot that drawn in a subplot

MATLAB: Plot all four functions

Related Question