How do I plot a function up to a certain value and start another function at that value for the same plot?

Question

Rafael 2024-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/2097661-how-do-i-plot-a-function-up-to-a-certain-value-and-start-another-function-at-that-value-for-the-same

评论： Rafael 2024-3-22

I'm plotting the power on a hydraulic cylinder over the angle of tilt of the beam that the cylinder is pushing. This is the code I have, and for the plot I want the "red line" to stop at a value of 2, and the "blue line" to start at the value of 2. How do I go about this?

Also, is it possible to connect both lines to represent a drop in power?

This is code:

%Calculations for tilting ONLY
AC=2.125;
Fc=8130.0375;
BD=2;
A=0.03^2.*pi;
%Varying angles 
a = 0:45;
Deg=sind(a);
FhN=2.125*Fc*Deg;
Fh=FhN/(BD*2*sind(10));
Ph=(Fh/A)/100000;
P_max=Fh*0.237;
P_rest=Fh*0.147;
% Power on Cylinder for Tilting
figure(1)
subplot(2,2,3)
plot(a,P_max,'r',a,P_rest,'b')
title('Power on HC')
axis([0 inf, 0 inf])
xlabel('Angle')
ylabel('Power [W]')

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Answer 1

Hassaan 2024-3-22

在 MATLAB Online 中打开

% Calculations for tilting ONLY

AC = 2.125;

Fc = 8130.0375;

BD = 2;

A = 0.03^2 * pi;

% Varying angles

a = 0:45; % Angle range

Deg = sind(a); % Sine of angles

FhN = 2.125 * Fc * Deg; % Normal force

Fh = FhN / (BD * 2 * sind(10)); % Horizontal force

Ph = (Fh / A) / 100000; % Hydraulic power

P_max = Fh * 0.237; % Max power

P_rest = Fh * 0.147; % Resting power

% Determine the index where angle is 2 degrees

angleLimit = 2;

idxLimit = find(a >= angleLimit, 1);

% Power on Cylinder for Tilting

figure(1)

subplot(2,2,3)

% Plot red line up to angle of 2 degrees, including the point at 2 degrees

plot(a(1:idxLimit), P_max(1:idxLimit), 'r')

hold on; % Hold on to plot on the same axes

% Plot blue line starting from angle of 2 degrees

plot(a(idxLimit:end), P_rest(idxLimit:end), 'b')

% Optionally, connect the two lines directly to represent a drop in power

% Find the last point of the red line and the first point of the blue line

lastPointRed = [a(idxLimit), P_max(idxLimit)];

firstPointBlue = [a(idxLimit), P_rest(idxLimit)];

% Plot a black line connecting these points

plot([lastPointRed(1), firstPointBlue(1)], [lastPointRed(2), firstPointBlue(2)], 'k--')

hold off; % Release the hold

% Additional plot settings

title('Power on HC')

axis([0 inf, 0 inf])

xlabel('Angle')

ylabel('Power [W]')

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