I am solving a quadratic interpolation on matlab and i need a bit help

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Mike Garret
Mike Garret 2015-4-12
评论： Mike Garret 2015-4-12
I solved this quadratic equation and i want to program it on matlab..here is the code xB=[-1.6 7.6 15.4 26.1 42.2 60.6];
yB=[20 40 60 100 200 400];
xxB=25;
n=length(xB)
if length(yB)~=n, error('x and y must be the same length');
end
D=0;
for i=1:n;
product=yB(i);
for j=1:n
if i~=j
product=product*((xxB-xB(j))/(xB(i)-xB(j)))*((xxB-xB())/(xB(i)-xB()));
end
end
D=D+product;
end
yBint= D
when i put j in the bracket for the xxB-xB().. it didnt give me the right answer. should i add a new variable e.g k ?
  2 个评论
Star Strider
Star Strider 2015-4-12
What do you want to do? I don’t see the parallels between the JPG image (that is difficult to read) and your code.
Mike Garret
Mike Garret 2015-4-12
i was given a table of values and i want to find what what the pressure is at 25 degrees...i have attached the original question..it is problem b

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