help in doing forward and backward difference...

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sri satya ravi
sri satya ravi 2016-9-2
回答： KSSV 2016-9-2
dv_dteta = zeros (length(crank_angle),1)
for j = 1:1:length(crank_angle-1) dv_dteta = (s(j+1)-s(j))./(crank_angle(j+1)-crank_angle(j)); end
when i write this i get an error code saying Index exceeds matrix dimensions.
the crank angle is a array of 300 data points.
is there a way to do a backward difference for the first point and the rest forward difference to match the dimensions???

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KSSV
KSSV 2016-9-2
You must use
j = 1:length(crank_angle)-1
rather then
j = 1:1:length(crank_angle-1)

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