Attachment "exprdoc.patch" to
ticket [758488ffff]
added by
dkf
2003-07-05 05:29:38.
Index: doc/expr.n
===================================================================
RCS file: /cvsroot/tcl/tcl/doc/expr.n,v
retrieving revision 1.10
diff -u -r1.10 expr.n
--- doc/expr.n 3 Jan 2003 23:03:22 -0000 1.10
+++ doc/expr.n 4 Jul 2003 22:20:49 -0000
@@ -194,14 +194,15 @@
invoking the \fBexpr\fR command.
.SH "MATH FUNCTIONS"
.PP
-Tcl supports the following mathematical functions in expressions:
+Tcl supports the following mathematical functions in expressions, all
+of which work solely with floating-point numbers unless otherwise noted:
.DS
.ta 3c 6c 9c
\fBabs\fR \fBcosh\fR \fBlog\fR \fBsqrt\fR
\fBacos\fR \fBdouble\fR \fBlog10\fR \fBsrand\fR
\fBasin\fR \fBexp\fR \fBpow\fR \fBtan\fR
\fBatan\fR \fBfloor\fR \fBrand\fR \fBtanh\fR
-\fBatan2\fR \fBfmod\fR \fBround\fR
+\fBatan2\fR \fBfmod\fR \fBround\fR \fBwide\fR
\fBceil\fR \fBhypot\fR \fBsin\fR
\fBcos\fR \fBint\fR \fBsinh\fR
.DE
@@ -229,7 +230,7 @@
than \fI0\fR, this is equivalent to \fBatan(\fIy/x\fB)\fR.
.TP
\fBceil(\fIarg\fB)\fR
-Returns the smallest integral floating point value (i.e. with a zero
+Returns the smallest integral floating-point value (i.e. with a zero
fractional part) not less than \fIarg\fR.
.TP
\fBcos(\fIarg\fB)\fR
@@ -240,15 +241,15 @@
an overflow, an error is returned.
.TP
\fBdouble(\fIarg\fB)\fR
-If \fIarg\fR is a floating value, returns \fIarg\fR, otherwise converts
-\fIarg\fR to floating and returns the converted value.
+If \fIarg\fR is a floating-point value, returns \fIarg\fR, otherwise converts
+\fIarg\fR to floating-point and returns the converted value.
.TP
\fBexp(\fIarg\fB)\fR
Returns the exponential of \fIarg\fR, defined as \fIe\fR**\fIarg\fR.
If the result would cause an overflow, an error is returned.
.TP
\fBfloor(\fIarg\fB)\fR
-Returns the largest integral floating point value (i.e. with a zero
+Returns the largest integral floating-point value (i.e. with a zero
fractional part) not greater than \fIarg\fR.
.TP
\fBfmod(\fIx, y\fB)\fR
@@ -261,7 +262,8 @@
.TP
\fBint(\fIarg\fB)\fR
.VS 8.4
-If \fIarg\fR is an integer value, returns \fIarg\fR, otherwise
+If \fIarg\fR is an integer value of the same width as the machine
+word, returns \fIarg\fR, otherwise
converts \fIarg\fR to an integer (of the same size as a machine word,
i.e. 32-bits on 32-bit systems, and 64-bits on 64-bit systems) by
truncation and returns the converted value.
@@ -280,7 +282,7 @@
is negative, \fIy\fR must be an integer value.
.TP
\fBrand()\fR
-Returns a pseudo-random floating point value in the range (\fI0\fR,\fI1\fR).
+Returns a pseudo-random floating-point value in the range (\fI0\fR,\fI1\fR).
The generator algorithm is a simple linear congruential generator that
is not cryptographically secure. Each result from \fBrand\fR completely
determines all future results from subsequent calls to \fBrand\fR, so
@@ -305,7 +307,7 @@
\fBsrand(\fIarg\fB)\fR
The \fIarg\fR, which must be an integer, is used to reset the seed for
the random number generator of \fBrand\fR. Returns the first random
-number from that seed. Each interpreter has its own seed.
+number (see \fBrand()\fR) from that seed. Each interpreter has its own seed.
.TP
\fBtan(\fIarg\fB)\fR
Returns the tangent of \fIarg\fR, measured in radians.
@@ -315,8 +317,8 @@
.TP
\fBwide(\fIarg\fB)\fR
.VS 8.4
-Converts \fIarg\fR to a value at least 64-bits wide (by sign-extension
-if \fIarg\fR is a 32-bit number.)
+Converts \fIarg\fR to an integer value at least 64-bits wide (by sign-extension
+if \fIarg\fR is a 32-bit number) if it is not one already.
.VE 8.4
.PP
In addition to these predefined functions, applications may
