## -2 Reputation

11 years, 204 days

## re: could you plz explain ......

The three are a class of backward differentiation formulae (BDF) of order two which were obtained from one continuous scheme evaluated at various points. eg, at xn+2 while the first derivative was evaluated at both xn and xn+1/2. this is in an attempt to avoid starters, hence we want to use the three schemes simultaneously to solve the equation and compare with existing methods.

thaxks again as i look forward to a reply.

## re: could you plz explain ......

The three are a class of backward differentiation formulae (BDF) of order two which were obtained from one continuous scheme evaluated at various points. eg, at xn+2 while the first derivative was evaluated at both xn and xn+1/2. this is in an attempt to avoid starters, hence we want to use the three schemes simultaneously to solve the equation and compare with existing methods.

thaxks again as i look forward to a reply.

## in the above, note that .......

in equation 1, n+1 is a subscript, i.e. yn+1, also n+1/2, n and n+2

in eq 2, n+2, n+1, n and n+2 are all subcripts and in eq 3,

n+1, n and n+1/2 are also subcripts.

## thx, it worked...

Kamel, that was great. i did d correction n got out the result. thx indeed

## thx, it worked...

Kamel, that was great. i did d correction n got out the result. thx indeed

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