## 12841 Reputation

11 years, 67 days

On google groups. (comp.soft-sys.math.maple and sci.math.symbolic)

On stackoverflow.

On math.stackexchange.com.

## 2D Input syntax problem?...

One way this can happen is if you are in 2D Input mode, trying to make multiple statements in a single paragraph, and forget the trailing semicolon (or colon) at the end of a line (not the last one).

For example,

 >
 >

 >

Error, illegal use of an object as a name

 >

 >

But that's just a guess. There are other ways to generate that error message. We cannot diagnose the particular problem unless you upload a worksheet that exhibits it.

## DocumentTools...

Try the commands DocumentTools:-RemoveTask or DocumentTools:-RemovePaletteEntry .

## fdiff or evalf(D(...))...

You can use fdiff or evalf(D(...)) as a means to get numeric differentiation of the procedure returned by your pds:-value(T(x,y), x=0) call.

It is more efficient to call pds:-value(T(x,y), x=0) just once, before forming procedure Ty, than to have Ty form it for each input y0.

Here are some variants:

 sys_ode := diff(g(y), y, y, y)+((n+3)/4)*g(y)*(diff(g(y), y, y))-((n+1)/2)*(diff(g(y), y))^2+h(y) = 0, (1(1-λ)/10+1/1)*(diff(h(y), y, y))+((n+3)/4)*g(y)*(diff(h(y), y))-n*(diff(g(y),y))*h(y) = 0