facing error in running it. please rectify

 x8d=linspace(150,110,180)
y8d=linspace(69,69,180)
%r6=24
xc = 75;
yc = 69;
r1=21
theta1 = linspace(0,-pi,180);
x1d = r1*cos(theta1) + xc;
y1d = r1*sin(theta1) + yc;

plot(x888,y888,'b')
h8 = plot(x888(1),y888(1),'bs','MarkerSize',7,'MarkerFaceColor','r');
for n = 1:180
set(h8, 'XData', x888(n), 'YData', y888(n));
end

Answer 1

[Walter Roberson]

Undefined function or variable 'x888'.

Well, that makes sense: you define x8d and y8d but not x888 or y888.

By the way, in your loop

for n = 1:180
set(h8, 'XData', x888(n), 'YData', y888(n));
end

you should add a

drawnow()

after the set()

[h b]

    x8d=linspace(150,110,180)
  y8d=linspace(69,69,180)
  %r6=24
  xc8 = 75;
  yc8 = 69;
  r1=21
  theta11 = linspace(0,-pi,180);
  x8c = r1*cos(theta11) + xc8;
  y8c = r1*sin(theta11) + yc8;
  x8b=linspace(40,0,180)
  y8b=linspace(69,69,180)

x888=[ x8d x8c x8b];
y888=[ y8d y8c y8b];

plot(x888,y888,'b')
h8 = plot(x888(1),y888(1),'bs','MarkerSize',7,'MarkerFaceColor','r');
for n = 1:180
set(h8, 'XData', x888(n), 'YData', y888(n));
DELAY = 0;
pause(DELAY);
drawnow
end

[h b]

i included. still showing error

[h b]

please help

[Walter Roberson]

No error message shows up. The code appears to be doing what it was designed to do. However, I suspect you would find the plot more interesting if you were to add

 hold on

after

plot(x888,y888,'b')

[h b]

thank you. i also want the pointers to enter-one after the other, with the time (gap)between their entry specified as per the user input. help

[Walter Roberson]

Which are the "pointers" ? Which variable holds the time gaps? Should the time gap be understood to be in terms of indices, or is it related to x values?

[h b]

Here, in the above code.

%execution one

for n = 1:180
-----
end
%execution 2
for n = 1:180
-----
end

Here, the execution 2 runs only after the execution 1 ends. i want, once the execution 1 is running, execution 2 should also start in a time difference given as input. ( time difference- difference in the start of both executions given as user-input in seconds)

Also In matlab, how to change the pointer/marker size to a square of dimension 1m* 2m moving in the path defined by the above code?

thanks in advance

[Walter Roberson]

You appear to be looking at different "above code" than I am. Please link to the code, or post it if it turns out not to be already posted.

[h b]

x8d=linspace(150,110,180)
  y8d=linspace(69,69,180)
  %r6=24
  xc8 = 75;
  yc8 = 69;
  r1=21
  theta11 = linspace(0,-pi,180);
  x8c = r1*cos(theta11) + xc8;
  y8c = r1*sin(theta11) + yc8;
  x8b=linspace(40,0,180)
  y8b=linspace(69,69,180)
x888=[ x8d x8c x8b];
y888=[ y8d y8c y8b];
h8 =plot(x888(1),y888(1),'bs','MarkerSize',7,'MarkerFaceColor','r');
h9= plot(x888(1),y888(1),'bs','MarkerSize',7,'MarkerFaceColor','b');
for n = 1:180
set(h8, 'XData', x888(n), 'YData', y888(n));
DELAY = 0;
pause(DELAY);
drawnow
end
for n = 1:180
set(h9, 'XData', x888(n), 'YData', y888(n));
DELAY = 0;
pause(DELAY);
drawnow
end

[h b]

1.here how to change the pointer shape to a rectangular object having 1m*2m dimension. 2. execution 2 to begin within a time difference specified by the user

Answer 2

[KSSV]

clc ;clear all 
x8d=linspace(150,110,180)
y8d=linspace(69,69,180)
%r6=24
xc = 75;
yc = 69;
r1=21
theta1 = linspace(0,-pi,180);
x888 = r1*cos(theta1) + xc;
y888 = r1*sin(theta1) + yc;
plot(x888,y888,'b')
h8 = plot(x888(1),y888(1),'bs','MarkerSize',7,'MarkerFaceColor','r');
for n = 1:180
set(h8, 'XData', x888(n), 'YData', y888(n));
drawnow
hold on
end

[h b]

i edited, this is the final , still showing error

x8d=linspace(150,110,180)
    y8d=linspace(69,69,180)
    %r6=24
    xc8 = 75;
    yc8 = 69;
    r1=21
    theta11 = linspace(0,-pi,180);
    x8c = r1*cos(theta11) + xc8;
    y8c = r1*sin(theta11) + yc8;
    x8b=linspace(40,0,180)
    y8b=linspace(69,69,180)
  x888=[ x8d x8c x8b];
  y888=[ y8d y8c y8b];
  plot(x888,y888,'b')
  h8 = plot(x888(1),y888(1),'bs','MarkerSize',7,'MarkerFaceColor','r');
  for n = 1:180
  set(h8, 'XData', x888(n), 'YData', y888(n));
  DELAY = 0;
  pause(DELAY);
  drawnow
  end

[Image Analyst]

There is no error when I ran it. If there is, then copy and paste all the red text back here.

[h b]

thanks. no error. i want the pointers to enter-one after the other, with the time (gap)between their entry specified as per the user input.