Plotting arrays as x and y axis.

I am having two arrays containing about 1000 datas. I have entered the datas using for loop. Now i need to plot the graph with one array as x axis and one array as y axis . How to do it

Answer 1

[Mischa Kim]

Are they both 1000x1 (or 1x1000) arrays? If yes, you can simply use

plot(x,y)

where x and y are the two arrays. If no, I need more info on the size of the arrays and on what exactly you would like to plot.

[ABHISEKH MUKHERJEE]

yes both the arrays are 1*1000 but when i'm using plot(x,y) then it is plotting only the final value and nothing else

[Mischa Kim]

Could you please post or attach some of the relevant code? You can try

size(x)

to check if x is really an array (matrix) and not just a scalar. Also, don't call the plot-function in the for -loop but after the loop is completed. Something like, for example:

for ii = 1:1000
   x(ii) = ii;
   y(ii) = sin(0.1*ii);
end

plot(x,y)

[ABHISEKH MUKHERJEE]

yes they are array because when i run them in a loop they give answers of the corresponding term

[ABHISEKH MUKHERJEE]

I did that way but no graph is plotted in my program

for i=1:1000
    y=p1(i)
    x=p2(i)
end
plot(x,y)

but no graph is plotted

[Mischa Kim]

OK, that's the problem. You are not generating an array but overwrite the same scalars. Assuming that p1 and p2 are arrays and defined, try:

for i = 1:1000 
   y(i) = p1(i);
   x(i) = p2(i); 
end

plot(x,y)

But then you can simply use plot(p2,p1) since they are equal to x and y.

[Image Analyst]

ABHISEKH, this is something you could have found out very easily by looking at the values of x and y right before you called plot. So this tells me you are not familiar with debugging and you should look at Doug's great video tutorial link: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/ It will help you a lot and make it so much faster for you to solve issues like this.

[Sophia Christel]

I have a similar problem. I have two arrays x and y (both in the 1x991 Double format) which I would like to plot against each other, but simply calling plot(x,y) doesn't do anything. I have:

x=0.1:0.01:10;
n=length(x);
y=zeros(1,n);

for k=1:n;
    y(k)=func(x(k),2,4);
end
plot(x,y)

I have checked both arrays and I don't see anything wrong with them.

[Dhrumil]

Graph an array of size 10x1 with random values plot the line of the array change the 3 element of the array with 10 and line color changed array with line doing red and the same plot

[Dhrumil]

Graph an array of size 10x1 with random values plot the line of the array change the 3 element of the array with 10 and line color changed array with line doing red and the same plot