HP NW280AAABA Manuel d'utilisateur télécharger pdf (Page 405)

100

101

Functions and commands 399

list2mat Returns a matrix of n columns made by splitting a list into

rows, each containing n terms. If the number of elements in

the list is not divisible by n, then the matrix is completed with

zeros.

list2mat(List, Integer)

Example:

list2mat({1,8,4,9},1) returns

lname Returns a list of the variables in an expression.

lname(Expr)

Example:

lname(exp(x)*2*sin(y)) gives [x,y]

lnexpand Returns the expanded form of a logarithmic expression.

lnexpand(Expr)

Example:

lnexpand(ln(3*x)) gives ln(3)+ln(x)

logarithmic_

regression

Given a set of points, returns a vector containing the

coefficients a and b of y=a*ln(x)+b, the natural logarithmic

function which best fits the set of points. The points may be the

elements in two lists or the rows of a matrix.

logarithmic_regression(Matrix) or

logarithmic_regression(List1, List2)

Example:

logarithmic_regression returns

[6.3299…, 0.7207…]

logb Returns the logarithm of base b of a.

logb(a,b)

Example:

logb(5,2) gives ln(5)/ln(2) which is approximately

2.32192809489

1.0 1.0

2.0 4.0

3.0 9.0

4.0 9.0

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HP NW280AAABA Manuel d'utilisateur Page 405

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