MATLAB: Specifying range of data from a plot?

dataplotting

This is my plot:

      x=1:5;
     y=rand(size(x));
     lh=line(x,y);
     xp=get(lh,'xdata');
     yp=get(lh,'ydata');

I understand the above code…but now I want to know the values of x when it has a specific relation to y.

How would I code that I want to know the values for x when y is equal or greater to a new variable n?

Something like: xSelect = get(lh,'xdata' if y>=n) ???? not sure how to code what I want.

Thanks for the help!

Best Answer

   xSelect = x(y>=n);

Related Solutions

MATLAB: Trying to make a piecewise function that isn’t for graphing or using the piecewise function itself

Use logical indexing on both sides of the assignment. E.g.,

function y = project2Tester(x)
  y = zeros(size(x));
    
  x1 = (x <= -1);
  y(x1) = log(abs(x(x1)));
  x2 = (-1 < x & x < 0);
  y(x2) = abs(x(x2));
  x3 = (0 <= x & x < 1);
  y(x3) = x(x3);
  x4 = (x >= 1);
  y(x4) = log(x(x4));
  y(~(x1 | x2 | x3 | x4)) = 0;  % not really needed since you initialized y to 0's
end

MATLAB: Picking the (n) th occurrence of a number in a vector or the (n)th row in a matrix.

% make a random vector of data just for example purposes
x = rand(25,1);
% define n for your nth element selection
n = 3 % for example every 3element
% make a vector with the nth elements
iSelect = 1:n:length(x);
% select every nth element
xSelect = x(iSelect)

You could also combine some of these lines of code to make it more compact

xSelect = x(1:3:length(x))

Best Answer

Related Solutions

MATLAB: Trying to make a piecewise function that isn’t for graphing or using the piecewise function itself

MATLAB: Picking the (n) th occurrence of a number in a vector or the (n)th row in a matrix.

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