Finding x value given y value

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David
David 2011-3-31
Hi all. I am using the following code to print a plot. How do i then fin a corresponding x value given y (m) = 80?
function qn1 A = 0.4; P = 101.3*10^3; T = 288.2; D = 1.225; Y = 1.4; R = 287.05; m=size(10);
%Start part a code Mi = 0:0.1:1; m = A.*Mi.*P.*((1+(0.4/2).*(Mi.^2)).^(2.4./-0.8)).*sqrt(1.4./(R.*T)); h=plot(Mi,m);
Cheers.

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回答（1 个）

Josh
Josh 2011-3-31
You must be doing some kind of low-speed aerodynamics... those numbers remind me of my undergrad years.
I believe you should look into polyfit and polyval. Polyfit will give you coefficients of a polynomial best-fit for a set of data points, then polyval will interpolate the data between the data points using those coefficients.

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