how to make automatic graph script with a for loop?

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Hi everybody, i'm trying to make the folowing script for grahp 7 points, but i do not understand why only represent only one point of the seven that i should draw.
hold on
grid on
n=0;
k=1;
step=1;
for i=7
y=con1+step;
x=1+step;
plot(x, y, '*');
k=k+1;
end
This are the 7 points
con1 =4.3e10
con2 =1.16e10
con3 =5.44e9
con4 =3.15e9
con5 =1.98e9
con6 =1.4e9
con7 =1.05e9
Can anyone help me to structure it better the code?. Thanks in advance

Accepted Answer

KSSV
KSSV on 18 Oct 2016
con = [4.3e10 ; 1.16e10;5.44e9;3.15e9;1.98e9;1.4e9;1.05e9 ] ;
hold on
grid on
n=0;
k=1;
step=1;
for i=1:7
y=con(i)+step;
x=1+step;
plot(x, y, '*');
k=k+1;
end
  1 Comment
Tony Castillo
Tony Castillo on 18 Oct 2016
Thanks for your help, in the code just lack x="(i)"+step; instead that x=1+step.
hold on grid on n=0; k=1; step=1; for i=1:7 y=con(i)+step; x=1+step; plot(x, y, '*'); k=k+1; end

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More Answers (2)

KSSV
KSSV on 17 Oct 2016
Edited: KSSV on 17 Oct 2016
Use hold on after plot command inside the loop...using hold on points are plotted on the same figure. If not every time new figure opens.
  3 Comments
Guillaume
Guillaume on 17 Oct 2016
Edited: Guillaume on 17 Oct 2016
The hold command needs to be issued before plotting.
Of course, you also have the issue highlighted by Adam
Adam
Adam on 17 Oct 2016
Edited: Adam on 17 Oct 2016
As long as the hold is before the 2nd plot it should work fine I would think. Of course ideally you would give the axes handle to the hold command
hold( hAxes, 'on' )
to avoid any unpleasant bugs creeping in, but in a simple script just
hold on
tends to work fine.

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Adam
Adam on 17 Oct 2016
Edited: Adam on 17 Oct 2016
Your for loop doesn't change anything so you just plot the same point every time. Neither con1 nor step changes so neither do x or y.
Did you mean to update step using 'i' or something like that? Or do you want con1 upto con7? In which case store them in a single array instead and access as
con(i)
rather than
con1
  2 Comments
Tony Castillo
Tony Castillo on 17 Oct 2016
When i do it, appear this error. Undefined function or variable 'con'.
Error in UntitledFOR (line 6) y=con(i)+step;
This is the code with your recommendation.
Adam
Adam on 17 Oct 2016
Well, of course you have to define con as an array containing all your values instead of the 7 variables you currently have as con1 to con7.

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