## 285 Reputation

15 years, 13 days

## what's wrong with crossproduct?...

Maple

I need three orthogonal unit vectors, k, i, and j. I give the first two vectors, k=[sqrt(2)-1,-1,1] and i=[1,sqrt(2)-1,0], then use crossproduct to produce the third vector j=crossprod(k,i) . But it fails to produce the correct vector since dotprod(j,k) is not 0.

## High quality images...

Maple

I have used Maple to do a lot of plottings. But the image quality is not always satisfactory.

So I wonder if Maple can produce high quality images (surfaces), like those displayed here:

http://xahlee.org/surface/gallery.html

## Find the first integer such that......

Maple

How can I write a Maple program (using if..else) to find the first positive integer n (between 1 and 355)such that 355 can divide n*m (m is an integer, say 199) ? Thanks for your help.

## How to display the value of contour line...

Maple

Is it possible to display the value of each contour line when using contourplot to plot contour lines? And how? Thanks.

Something like this:

## A series problem...

Maple

I wonder how to use Maple to define the following function and draw its graph.

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