## 20 Reputation

13 years, 309 days

## sqrt(x^2) = +x or -x ?...

Maple 17

Hi, I have a problem related to the cancellation of the square root with a square in its argument, see the image below.

Santiago

## How to use a NULL result from fsolve as ...

Maple 18

Hi, I am using fsolve to find the roots x of a nonpolynomial expression f(x,a) = 0, using a loop for do to vary the values of the parameter a in small identical steps. At some stage, fsolve cannot find a solution. According to the Maple help, in this case fsolve returns a NULL sequence. I would like to know how to use the fact that fsolve cannot find a solution to break the loop with an if-then statement.

## Unwanted line in plot with spacecurve...

Maple

Hi, I am trying to plot a parabola in spherical coordinates using the command spacecurve, using

>with(plots);

>spacecurve([cot(phi)/sin(phi), 1.61, phi], phi = -3.14 .. 3.14, numpoints = 3000, axes = normal, coords = spherical, color = red, linestyle = dash, axes = normal)

(I know it is easier in Cartesian coords, but I am doing this as a first version of a more complicated curve, given by the sol. of a system of differential equations).

Maple plots the parabola correctly but it joins the initial and the final points of the plot with a straight line, yielding something that looks like a U with a bar on top (I cannot upload the image). Is there any way to get rid of the line?

## intel core solo...

Maple

hi, i would like to know if the classic interfase of maple 12 or higher would work

reasonably well with the 1.4GHz Intel Core 2 Solo SU3500 processor, 2GB of RAM.

if not, what would be the minimum requierments in terms of processor.

thanks,

santiago

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