Array problem

Hey every1, I am actually having trouble with arrays!! I have my plot and is underneath and it is not saved in array at the moment but I would like to story it in array so I should have a value for[x1,y1] in an array.. the question is how can I get the values of the plots and store it in an array???

x = linspace(min(Sa),max(Sa),100);
y = pchip(Sa,lambda(Sa),X);
plot(x,y)

a [x,y] then is it by looping through it and if it is how can we say then the next value in x and y.. I want to store each pair value(x,y) of the plot in an array???

Your help will be appreciated!

[Susan]

My plot perfectly works, it is just regarding the array part !

Answer 1

[Paulo Silva]

SusanArray=[x;y]; %2 rows, first row is x and second is y
%each column is a pair of values

[Susan]

Yeah I know that bit, but how can I actually take the values from x,y and store it there???? i dont know how to access the values created in the plot, i want each point (x1,y1),x2,y2),etc.. how can I get the values from the plot??

Answer 2

[Walter Roberson]

h = find(gca,'type','line');
xd = get(h, 'XData');
yd = get(h, 'YData');

[Susan]

Can you please explain to me the three lines.. Is it meant to be ..

h = find(x,y)

xd = get(h,x)

yd - get(h,y) ????

[Oleg Komarov]

findobj(gca,'type','line')

[Susan]

Can you explain to me this?

[Susan]

I did this but it resulted with empty array .. h =findobj(gca,'type',X)

disp(h)

[Nathan Greco]

After you create your plot, type the lines Walter provided you.

findobj(gca,'type','line') will return the handle of the line object on your current plot. With this handle, you can retrieve the x and y data by using get(h,'XData') and get(h,'YData') respectively...

[Susan]

I typed exactly the three line Walter suggested after the plot and I got an error..

Error using ==> find

Second argument must be a positive scalar integer.

[Nathan Greco]

And he corrected his "find..." line to be "findobj..." within the comments.

Answer 3

[Susan]

Ok, I've read about this line you guys suggested h = find(gca,'type','line');... But what I am looking for is the actual values of the plot (x1,y1),(x1,y2) etc.. and from what I understood this line is not doing this..

Any Ideas how to get the plot values and store it in an array???

[Nathan Greco]

Please be more precise. Are the values on the plot that you are trying to retrieve the same ones that you used to create the plot? Are you trying to take smaller stepped values from the plot? Saying (x1,y1) etc. is not very helpful.

[Susan]

Yeah I want the values that created my plot, I want to store it in an array..

[Nathan Greco]

Are they not already stored in arrays? If I'm not mistaken, that is exactly what your original x and y arrays are. If you wanted them in one array, just concatenate them together as Paulo answered. If you wanted to retrieve that same data from the plot (why? I don't know), follow Walter's method, replacing his "h = find(gca,'type','line');" with "h = findobj(gca,'type','line');". If this doesn't work for you, please say why not.

[Susan]

Oh thank you very much.. I don't know why I was trying to work on the very long way.. Paulo's method worked.. Thanks a lot.. I was well confused :)