Hp 49g+ User Manual download pdf (Page 742)

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101

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Graphic objects (GROBs)

The word GROB stands for GRaphics OBjects and is used in the calculator’s

environment to represent a pixel-by-pixel description of an image that has

been produced in the calculator’s screen. Therefore, when an image is

converted into a GROB, it becomes a sequence of binary digits (binary digits

= bits), i.e., 0’s and 1’s. To illustrate GROBs and conversion of images to

GROBS consider the following exercise.

When we produce a graph in the calculator, the graph become the contents

of a special variable called PICT. Thus, to see the last contents of PICT, you

The display shows in stack level 1 the line Graphic 131×64 (if using the

standard screen size) followed by a sketch of the top part of the graph. For

example,

If you press ˜ then the graph contained in level 1 is shown in the

calculator’s graphics display. Press @CANCL to return to normal calculator

display.

The graph in level 1 is still not in GROB format, although it is, by definition, a

graphics object. To convert a graph in the stack into a GROB, use: 3`

„°L@)GROB @

GROB . Now we have the following information in level 1:

The first part of the description is similar to what we had originally, namely,

Graphic 131×64, but now it is expressed as Graphic 13128 × 8.

However, the graphic display is now replaced by a sequence of zeroes and

ones representing the pixels of the original graph. Thus, the original graph as

now been converted to its equivalent representation in bits.

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Hp 49g+ User Manual Page 742

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