Best method to define a linear piece-wise function given limits and line equations?
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I am writing a function(also new to matlab) that is fed the following:
1. the x limits of each piece
2. the slope and intercept values of each piece
3. the y values for which I am trying to find corresponding x values
How can I write a function that can take any number of pieces, and create a piece-wise function? I then would like to be able to feed it y values and return the corresponding x values. I currently can only write the function for a given number of pieces, not any number..?
My code thus far:
%%define the piecewise function
function x = peicewisehot(y,Hbreaks,slope)
%y; input from user
%Hbreaks; vertical breaks
%slope; slope of equation
%x = (y-b)/m
for i = 1:length(y)
if y(i) >= Hbreaks(1) & y(i) < Hbreaks(2)
x(i) = (y(i) - b(1))./slope(1);
elseif y(i) >= Hbreaks(2) & y(i) < Hbreaks(3)
x(i) = (y(i) - b(2))./slope(2);
else
x(i) = nan;
end
end
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Réponse acceptée
Walter Roberson
le 2 Jan 2012
Please see the following hints:
Looks to me like you could use interp1() and ppval()
3 commentaires
Walter Roberson
le 3 Jan 2012
yinterp1 = interp1(B, Hhotpt, 'linear', 'pp');
Notice the "u" is not passed, as you are not interpolating at specific points when you create the pp.
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