Array problem

Question

Susan 2011-7-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/12464-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!

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Susan 2011-7-26

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

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Answer 1

Paulo Silva 2011-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/12464-array-problem#answer_17034

在 MATLAB Online 中打开

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

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Susan 2011-7-26

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??

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Answer 2

Walter Roberson 2011-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/12464-array-problem#answer_17036

在 MATLAB Online 中打开

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

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Susan 2011-7-26

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 2011-7-26

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

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Answer 3

Susan 2011-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/12464-array-problem#answer_17040

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???

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Nathan Greco 2011-7-26

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 2011-7-26