Matrix Elements VB-800 Instrukcja Użytkownika Pobierz pdf (Strona 163)

A7.2 Comparison 155

A7.2.9 Operators

The following have a different symbol:

Gauss Ox

.*. **

/= !=

not !

and &&

or ||

The following Gauss operators are not

supported in Ox: % (Ox has the idiv

function) !*~.’.

For x! use exp(loggamma(x+1)) or

gammafact(x+1) in Ox.

The text form of the relational operators

are not available in Ox, so e.g. use .< in-

stead of .LT.

There are no special string versions of op-

erators in Ox.

The ^ operator is matrix power, not ele-

ment by element power.

And ﬁnally, x=A/b (with A and b con-

formable) does not solve a linear system,

but is executed as x=A*(1/b). This fails,

because intended is x=(1/A)*b.The1/A

part in Ox computes the generalized in-

verse if the normal inverse does not work.

A7.2.10 Loop statements

Gauss has the do while and do until

loop:

i=1;

do while (i <= 10);

/* something */

i=i+1;

endo;

i = 10;

do until (i < 1);

/* something */

i=i-1;

endo;

Recently a for loop statement has been

added to Gauss.

Ox has the for, while and do while loop

statements (note the difference in the use

of the semi-colon).

for (i = 0; i < 10; ++i)

{

/* something */

}

i = 10;

while (i >= 1)

{

/* something */

--i;

}

i=1;

{ /* something */

++i;

} while (i <= 10);

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