forward, backward, center approximations for f(x) = e^x-2x+1

how toget starded

[Walter Roberson]

I suggest getting started by googling the formulas for forward, backwards, and center approximations.

Answer 1

[Walter Roberson]

Hint:

for K = 1 : numel(y);
    xdiff(K) = x(K+2) - x(K+1);
end
for K = 1 : numel(y)
    yleading(K) = y(K);
end
for K = 3 : numel(y)
    ytrailing(K-2) = y(K);
end
for K = 1 : numel(yleading)
    ydiff = ytrailing(K) - yleading(K);
end
for K = 1 : numel(ydiff)
    centerdiff(K) = ydiff(K) ./ xdiff(K);
end

Note that there are deliberate bugs in this code... besides it being written in just about the most inefficient way possible.