How can i find a value?

I have a x-y table that i insert from excel file The x has values that goes like 5m 10m.... 3000m And u want to find the y of a x value that it is not in the excel for example i want to find the y value of x=6m I have to make a line throught the closest point with 6( 5 and 10) then find the y=ax +b and then find the y value of 6 The program must does this procedure for any x value ( ps: the line y=ax+b between the closest points) Thankyou very much

Answer 1

[Ameer Hamza]

interp1(): https://www.mathworks.com/help/matlab/ref/interp1.html does exactly this.

x; % x-values from excel file
y; % y-values from excel file

xq = 6; % point at which you want to find y
yq = interp1(x, y, xq); % value of y

[Andreas Makrides]

Thankyou very much

[Ameer Hamza]

I am glad to be of help!!!