Campbell DSP4 Spezifikationen PDF herunterladen (Seite 240)

Section 8. Processing and Math Instructions

8-18

The following example illustrates a procedure that calculates base-10

logarithms:

Log10 = Log(X) / Log(10)

Log Function Example

The example calculates the value of e, then uses the Log function to calculate

the natural logarithm of e to the first, second, and third powers.

Dim I, M 'Declare variables.

BeginProg

M = Exp(1)

For I = 1 To 3 'Do three times.

M =Log(Exp(1) ^ I)

Next I

EndProg

LOG10 (number)

The LOG10 function returns the base 10 logarithm of a number.

Syntax

x = LOG10 (number)

Remarks

The LOG10 function returns the logarithm base 10 of a number.

The number argument can be any valid numeric expression that has a value

greater than 0. You can calculate base-n logarithms for any number x by

dividing the logarithm base 10 of x by the logarithm base 10 of n as follows:

LOGN( x ) = LOG10( x ) / LOG10( n )

LOG10 Function Example

This example uses the LOG10 instruction to calculate the log base 2 of 1000.

Dim LOG2_1000 'Declare variables.

BeginProg

LOG2_1000 = LOG10(1000)/LOG10(2)

EndProg

MaxSpa (Dest, Swath, Source)

Finds the maximum value in an array.

Syntax

MaxSpa(Dest, Swath, Source)

1 2 ... 235 236 237 238 239 240 241 242 243 244 245 ... 329 330

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Campbell DSP4 Spezifikationen Seite 240