Plots return a blank window

Hi! I wrote a script on matlab2012 but when I run the script on 2014a all of my plots return a blank window. If I however use the brush then I can see the points. Below is an extract from the script. Please help.

for p=pi-B1:0.01:pi

k=sin(2*pi*((p-pi)/B1));

hbiss=hmax*((2*pi)/(B1^2))*k;

h1=hmax*(1+((p-pi)/B1)-((1/(2*pi))*k));

c1=-(m1*(w^2)*hbiss)/(d+h1);

plot(p,c1,'b')

xlabel('psi')

ylabel('c')

title('spring constant')

hold on

end

[Azzi Abdelmalek]

To test your code we need the values of your variables

Answer 1

[Azzi Abdelmalek]

B1=3
hmax=10
m1=10
w=1
d=4
for p=pi-B1:0.01:pi
   k=sin(2*pi*((p-pi)/B1));
   hbiss=hmax*((2*pi)/(B1^2))*k;
   h1=hmax*(1+((p-pi)/B1)-((1/(2*pi))*k));
   c1=-(m1*(w^2)*hbiss)/(d+h1);
   plot(p,c1,'*b')
   hold on
end
xlabel('psi')
ylabel('c')
title('spring constant')

[Azzi Abdelmalek]

Lee commented

Here are my variables;

B1=(74*pi)/180; %beta 1 [rads]
m1=0.22; %massa 1 [kg]
Nnoll=3000; %[rpm]
hmax=0.003; % hmax [m]
dnoll=0.2; % delta noll [-]
n=(Nnoll/60)*1.2; %varvtalet
w=2*pi*n; %vinkelhstighet
d=dnoll*hmax;

[Azzi Abdelmalek]

B1=(74*pi)/180; %beta 1 [rads]
m1=0.22; %massa 1 [kg]
Nnoll=3000; %[rpm]
hmax=0.003; % hmax [m]
dnoll=0.2; % delta noll [-]
n=(Nnoll/60)*1.2; %varvtalet
w=2*pi*n; %vinkelhstighet
d=dnoll*hmax;
for p=pi-B1:0.01:pi
 k=sin(2*pi*((p-pi)/B1));
 hbiss=hmax*((2*pi)/(B1^2))*k;
 h1=hmax*(1+((p-pi)/B1)-((1/(2*pi))*k));
 c1=-(m1*(w^2)*hbiss)/(d+h1);
 plot(p,c1,'.b')
 hold on
end
xlabel('psi')
ylabel('c')
title('spring constant')

%or

B1=(74*pi)/180; %beta 1 [rads]
m1=0.22; %massa 1 [kg]
Nnoll=3000; %[rpm]
hmax=0.003; % hmax [m]
dnoll=0.2; % delta noll [-]
n=(Nnoll/60)*1.2; %varvtalet
w=2*pi*n; %vinkelhstighet
d=dnoll*hmax;
p1=pi-B1:0.01:pi;
c1=zeros(size(p1));
ii=0;
for p=p1;
  ii=ii+1;
  k=sin(2*pi*((p-pi)/B1));
  hbiss=hmax*((2*pi)/(B1^2))*k;
  h1=hmax*(1+((p-pi)/B1)-((1/(2*pi))*k));
  c1(ii)=-(m1*(w^2)*hbiss)/(d+h1);
end
plot(p1,c1,'.b')
xlabel('psi')
ylabel('c')
title('spring constant')

[Lee]

Ok thanks. But why did the window not display anything? The code was the same only the version of matlab was different. The only difference I can see is a dot before "b": I wrote "plot(p,c1,'b')" and you wrote "plot(p,c1,'.b')"

[Azzi Abdelmalek]

plot([0 1],[1 2],'b')

% What you see in blue is the line between the two points. You can also specify the type of line

plot([0 1],[1 2],'--b')

You can also specify the type of marker

plot([0 1],[1 2],'*--b')

In your case for one point

plot(1,2,'b')  % you didn't specify neither type of line(which is impossible because you have one point) nor marker for your point.

plot(1,2,'*b')  % for example

For more details read the documentation http://it.mathworks.com/help/matlab/ref/plot.html#btzpm1x

Answer 2

[TEJASHREE PAWAR]

hi , i wrote the following code. but the graph is not plotted. it shows a blank window with just the x and y axes.

clc close all

Rs=2; Vs=10;

for Rl=2:2:20 Is=(Vs/(Rs+Rl)) Il=Is; I=Is; Y=(((Il^2)*Rl)/(Vs*Is))*100 plot(I,Y) hold on end xlabel('I') ylabel('Y')