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How to interpolate to get two values for one variable?

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KH
KH 2012-12-4
I have a graph which is ascending in the beginning and will descend afterwards.
Let's say my y-axis is Y, and x-axis is X,
for a certain Y value, it will give two values on the x-axis.
say in this case i set Y to a value of 20, but it only gives me one X value, which is the latter value when the graph is in its descending portion. How do I get the X value for the initial ascending part of the graph?
I did something like this: interp1(Y,X,20)
Kindly advice.. Thanks!

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John Petersen
John Petersen 2012-12-4
Use the same index for each parameter. If you want to know the values of X for a given value of Y,
yind = (Y==yvalue);
xvalues = X(yind); % values of x that correspond to yvalue

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