MATLAB: How to find values of y for a given x when both are arrays

extracting information of arrays

Hola Hola.. was wondering how to make it so, that I can know exactly the value of y for a given x when x and y are arrays. I've seen many options online but I just get an empty []. Please help. I have the graph below and want to extract the y values of all three lines (I've given only info on one of the three)along different x values, for example x=0.5, x=0.55, x=0.6, x=0.65.

and y are

x=linspace(0.46,0.7,281);
y=wdth_8mm;(see attached file);

Best Answer

Let (x,y) be data you have. And you want to find yi for given xi. For this you have to do interpolation. Read about interp1.

yi = interp1(x,y,xi)

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MATLAB: How to find value on a curve for different x

% 

y=[0.13 0.31 0.45 0.59 0.70 0.79 0.85 0.92 0.97 1];
x=0.1:0.1:1;
plot(x,y,'-')
% xlim([0 1]);
% 
% ylim([0 1]);
xi =0.01 ;
yi = interp1(x,y,xi,'spline') ;
hold on
plot(xi,yi,'*r')

Read about interp1

MATLAB: How to find X Value given Y value and show the point on a plot

x = 0:1:25;
y = exp(-0.03*x);
figure;
semilogy(x,y);
%
yi = 0.5 ;
xi = interp1(y,x,yi) ;
hold on
semilogy(xi,yi,'*r')

Best Answer

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MATLAB: How to find value on a curve for different x

MATLAB: How to find X Value given Y value and show the point on a plot

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