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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: