When running code it returns >> pp01 Error using plot Error in color/linetype argument. Error in pp01 (line 33) plot(t(:),​z(:,1),'W'​,t(:),z(:,​2),'F')

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function pp01
clear
global As Qt g A c
As=15;
Qt=10;
g=9.81;
A=(121/64)*pi;
c=0.02;
z1_initial=10;
z2_initial=25;
N=1000;
h=0.5;
t=zeros(N,1);
z=zeros(N,2);
t(1)=0;
z(1,1)=z1_initial;
z(1,2)=z2_initial;
for n=1:N-1
t(n+1)=t(n)+h;
z(n+1,:)=z(n,:)+h*f(t(n),z(n,:));
z(n+1,:)=z(n,:)+0.5*h*(f(t(n),z(n,:))+f(t(n+1),z(n+1,:)));
end
%plot(t(:),z(:,1),'W',t(:),z(:,2),'F')
Figure 2
Plot(z(:,1),z(:,2))
[t,z];
return
function dzdt=f(~,z)
global As Qt g A c
%dzdt(1)=z(2);
%dzdt(2)=-z(1);
dzdt(1)=(1/As)*(z(2)-Qt);
dzdt(2)=-g*(A/2)*(z(1)+(c*abs(z(2))*z(2)));
return

Risposte (1)

Walter Roberson
Walter Roberson il 20 Apr 2019
'W' is valid as a code for White but 'F' is not a color abbreviation and is not a marker shape code. Valid codes are
  • b: blue
  • c: cyan
  • d: diamond marker
  • g: green
  • h: hexagon marker
  • k: black
  • m: magenta
  • o: circle marker
  • p: pentagram marker
  • r: red
  • s: square marker
  • v: down triangle marker
  • w: white
  • x: x marker
  • y: yellow
  • *: * marker
  • +: + marker
  • . : dot marker
  • ^: upward triangle marker
  • <: left triangle marker
  • >: right triangle marker
  • - and : are used for line styles
  2 Commenti
Lucy Raistrick
Lucy Raistrick il 20 Apr 2019
That seems to have fixed an issue but now this error is appearing
>> pp01
Undefined function or variable 'Figure'.
Error in pp01 (line 35)
Figure 2
Walter Roberson
Walter Roberson il 20 Apr 2019
MATLAB has been case sensitive for quite a while now. The graphics routines all start with lower case letters. figure and plot not Figure and Plot

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