## MaplePrimes Questions

Here is my problem: I am trying to plot this: y=(pi(sqrt(4-(x^2)))/((x^2)+4) but i get this error, when trying to plot. Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct Error, empty plot please help ASAP

## vector length in Maple 10.0 Classic worksheet...

Hi. Anyone knows a command on how to calculate the norm (length) of a vector? For example: Maple input: START >restart:with(linalg):#I know this package is obsolete, but my Teach only teaches theese commands.. >u:=vector([1,1,1,1]);#a vector i defined >LengthU:=sqrt(u[1]^2+u[2]^2+u[3]^2+u[4]^2);#This is how I calculate the length theese days... END Anybody knows a command, so that my third line will not be neccesary? TIA

## Syntax for Commands in the Logic Package...

After reviewing the help pages on the Logic package I noticed that the commands used in examples usually contained an ampersand "&" before them. Does this in any way alter the meaning of the logical operator or (connective) in any from it's usual meaning in standard text ? for example, is &iff "if and only if" ? does ∧ stand for "and" ? does ∨ mean the logically inclusive "or" does &implies mean "if antecedent then consequent" ? and so forth... Dan

## MATLAB coding...

Hello members, My question is out of maple primes, but i was wondering if one of the members is and expert in MATLAB coding. I am trying to write a MATLAB code for numerical integration for a double exponential equation of the form i = io(exp(-alpha*t)-exp(-beta*t). The problem i am facing is how to eliminitate the error as the integration is taken as the area under the curve, say from time t=0.0 to t=25e-6. Your comments in how to solve this problem is highly appreciated. Regards, JacquieD.

## Shading under a curve in a 2D plot...

I am wondering how to shade a portion of the plane under a curve from say x=a to x=b. To be more specific suppose I have the function f(x) = 5 - x^2. I want to plot this function and shade the region under this curve and above the x-axis from x = 1 to x=2. How can I shade it with a solid color; and how can I shade it with a striped region. I imagine there must be some "shade" command or option. Your assistance will be appreciated. Tom

## Tautologies...

Can Maple be used to see if propositional logic sentences with arbitary propositional constants are tautologies ? i.e. (if they are always true under every possible interpretation or arrangement of the truth values true and false).

## Basic Expression Manipulation...

Hi There, I am new to Maple and would appreciate some help on basic polynomial manipulation. I have the following type of equation that I need to simplify by factoring out the x^r component. How do I do this in Maple 10? Equation to manipulate x^(n+r)*(n+r-1)*c[n]+(n+r)*x^(1+n+r)*c[n] What maple commands do I use to get the following? x^r*[x^(n)*(n+r-1)*c[n]+(n+r)*x^(1+n)*c[n]] Thanks very much

## convex set of some points in R2...

I have the following points in R-2, (1,1) , (3,4), (1,5), (0-4), (-3,1). How may I obtain graphically the minimal convex set with contains all this points?. I found the commad convexhull.. but I am not sure how to use it. (I use Maple10) Thanks in advance, JJacques

## a*[[V]] * b*[[mV]] giving (a*b)*([[V]]*[[mV]]) ins...

I am trying to multiply a number in volts with a number in mV. the answer it gives me, though, is in [[V]]*[[mV]]. How do I make it convert the answer to [[V]] automatically?

## How can i make the fonts smooth?...

Hello How do I make the font in Maple 9.5 smooth. The fonts look horrible. I think its due to java as java fonts are horrible. They aint smooth like Microsoft fonts. If you were to compare a MS Trembauchet font with a Java Trembauchet font, the MS Trembauchet puts the Java font at bottom of the Top 100 list. Anyone know how I can make it appear smoother? Ben

## How do I can to develop a meteorology model with M...

Hello, I'm sorry for my poor English, my name is Arnaud, I'm 17 years old junior in a School (Laurent de Lavoisier) in France. I have a probem, I'd like to develop a program for meteorology modelisation with Maple. How could you do it? Thank you in advance. MOTZ Arnaud

## referencing a table, or something better...

if I have a table of data of the form: A | 1 | 2 | 3 B | 5 | 2 | 5 C | 9 | 8 | 2 ... how can I reference the table? I am working in document mode and I cannot figure out how to name the table to access it (hopefully) like "table1[1,2]" if this is not possible, is there some other way to do what I am wanting? It has to not only be a functional solution, but a graphical one as well, because this is for a report to hand in (so I can't "table1:=...") thanks, patrick