Subplot is failing to produce the figure that I want, where have I messed up?

Question

Mark Dillon 2015-7-17

0
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回答： Walter Roberson 2015-7-17

When I run the script I can only get the figure to produce the plot column 1 row 1, but it needs to produce a lot more. I should be getting back the top figure for the first part, and the bottom image for the second part on the image below:

Here is the code I am working with:

% Find the position of the teacup handle on the ride in different positions
% Clear window, variables, figure
clear;
clc;
clf;
% Variables
R = 6;        % Radius of big platter (meters)
r = 1;        % Radius of teacup (meters)
P_theta = [0 60 120 180 240 300]; % Platter in degrees
H_theta = [0 90 180 270]; % Handle in degrees
% Plot for platter and handle
k = 1;
for h = 1:length(H_theta);
    for p = 1:length(P_theta);
        figure(1);
        xh = r.*cosd(H_theta(h)); % x-coord. for handle, meters
        yh = r.*sind(H_theta(h)); % y-coord. for handle, meters
          % Plot circle of the platter
          t = linspace(0,2*pi); % radians
          xp = R.*cos(t); % x-coord. for platter, meters
          yp = R.*sin(t); % y-coord. for platter, meters
          subplot(length(H_theta),length(P_theta),k);
          plot(xp,yp,'-k');
          hold on;
          xc = r.*cos(t); % x-coord. for cup, meters
          yc = r.*sin(t); % y-coord. for cup, meters
          xc = xc+R.*cosd(P_theta); % x-coord. for moved cup, meters
          yc = yc+R.*sind(P_theta); % y-coord. for moved cup, meters       
          xh = xh+R.*cosd(P_theta); % x-coord. for moved handle, meters
          yh = yh+R.*sind(P_theta); % y-coord. for moved handle, meters      
          % Plot teacup and handle
          plot(xc,yc,'-r');
          plot(xh,yh,'kx');
          xlable('meters');
          ylable('meters');
          title('Teacup on Platter');
          if h == 1
              figure(2);
              subplot(length(H_theta), length(P_theta), p );
              plot(xp,yp,'-k');
              hold on;
              % Plot teacup and handle, part 2
              plot(xc,yc,'-r');
              plot(xh,yh,'kx');
              xlable('meters');
              ylable('meters');
              title('Teacup on Platter');
          end
      end
      k = k+1;
  end

This is the image I am getting back:

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Walter Roberson 2015-7-17

You failed to mention the error about matrix dimensions disagreeing while using '+'

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Answer 1

Walter Roberson 2015-7-17

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在 MATLAB Online 中打开

Right after your first plot, you do

t = linspace(0,2*pi);
xc = r.*cos(t)
xc = xc+R.*cosd(P_theta)

t is a vector of length 100, so xc becomes a vector of length 100. R is a scalar. P_theta is a vector of 6 elements. cosd() of a vector of 6 elements is a vector of 6 elements. A scalar times a vector of 6 elements is a vector of 6 elements. A vector of 100 elements "+" a vector of 6 elements is an error.