Commodore Plus 4 - Page 73

BASIC Version 3.5 Commands, Functions, and System Variables 61
Give the coordinates of the point on the graphic screen where you want the
pixel cursor to be moved. The next drawing will use this point as its starting point
unless the drawing command gives some other starting point. For more informa
tion, see Chapter 4.
Example: 10 GRAPHIC 4,1
20 LOCATE 30, 25 Puts the pixel cursor at column 30, row 25.
30 DRAW TO 60,50 Draws a line from the current pixel-cursor location
to column 60, row 50.
LOG Abbr. none
LOG (number)
Finds the natural logarithm of a number. LOG returns the log base e (e = the
mathematical constant, approximately 2.71828183) of the number in paren
theses. Divide by LOG(IO) to get the log base 10. For more information, see the
Mathematical Calculations section of Chapter 3.
Parameter: any numeric expression with a positive value
Examples: PRINT L0G(2) Prints the natural logarithm of 2.
.693147181
PRINT L0G(2)/L0G(10) Prints the logarithm base 10 of 2.
.301029996
LOOP Abbr. loO
Works with DO to set conditions for a repeated sequence of program lines. See
DO.
MID$ Abbr. ml
MID$ (string, start position, length)
Gets a substring of the specified length within a master text string. MID$ starts
the substring at the character position specified. MID$ can also be used to change
part of a text string.
Parameters: master string, starting position, number of characters to use
1. The master string can be any text string, text-string variable, or string
expression.
2. The substring is begun at the starting position; characters that come before
the starting position are not used. The starting position can be any character
position in the master string. If it is greater than the length of the master string, a
null string is returned.