HP 50G, User Manual, Page: 435 / 887

Page 12-52
of F. The question marks indicates uncertainty or non-definition. For example,
for X<0, LN(X) is not defined, thus the X lines shows a question mark in that
interval. Right at zero (0+0) F is infinite, for X = e, F = 1/e. F increases before
reaching this value, as indicated by the upward arrow, and decreases after this
value (X=e) becoming slightly larger than zero (+:0) as X goes to infinity. A
plot of the graph is shown below to illustrate these observations:
Function DRAW3DMATRIX
This function takes as argument a n
×
m matrix, Z , = [ z
ij
], and minimum and
maximum values for the plot. You want to select the values of v
min
and v
max
so
that they contain the values listed in Z . The general call to the function is,
therefore, DRAW3DMATRIX( Z ,v
min
,v
max
). To illustrate the use of this function
we first generate a 6
×
5 matrix using RANM({6,5}), and then call function
DRAW3DMATRIX, as shown below:
The plot is in the style of a FAST3DPLOT. Different views of the plot are shown
below: