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This commit is contained in:
Landon Curt Noll
84
help/define
84
help/define
@@ -6,11 +6,11 @@ SYNTAX
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define fname([param_1 [= default_1], ...]) { [statement_1 ... ] }
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TYPES
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fname identifier, not a builtin function name
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param_1, ... identifiers, no two the same
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default_1, ... expressions
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expr expression
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statement_1, ... statements
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fname identifier, not a builtin function name
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param_1, ... identifiers, no two the same
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default_1, ... expressions
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expr expression
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statement_1, ... statements
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DESCRIPTION
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The intention of a function definition is that the identifier fname
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@@ -30,17 +30,17 @@ DESCRIPTION
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For example, suppose a function f and a global variable A have been
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defined by:
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; define f(x) = (x = 3);
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; global mat A[3];
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; define f(x) = (x = 3);
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; global mat A[3];
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If g() is a function that evaluates to 2:
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; f(A[g()]);
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; f(A[g()]);
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assigns the value of A[2] to the parameter x and then assigns the
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value 3 to x:
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; f(`A[g()]);
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; f(`A[g()]);
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has essentially the effect of assigning A[2] as an lvalue to x and
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then assigning the value 3 to A[2]. (Very old versions of calc
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@@ -79,7 +79,7 @@ DESCRIPTION
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If the expr is omitted from an expression definition, as in:
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; define h() = ;
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; define h() = ;
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any call to the function will evaluate the arguments and return the
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null value.
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@@ -105,11 +105,11 @@ DESCRIPTION
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After fname has been defined, the definition may be removed by the command:
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; undefine fname
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; undefine fname
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The definitions of all user-defined functions may be removed by:
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; undefine *
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; undefine *
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If bit 0 of config("resource_debug") is set and the define command is
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at interactive level, a message saying that fname has been defined
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@@ -120,8 +120,8 @@ DESCRIPTION
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The identifiers used for the parameters in a function definition do
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not form part of the completed definition. For example,
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; define f(a,b) = a + b;
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; define g(alpha, beta) = alpha + beta;
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; define f(a,b) = a + b;
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; define g(alpha, beta) = alpha + beta;
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result in identical code for the functions f, g.
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@@ -129,22 +129,22 @@ DESCRIPTION
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function are displayed on completion of its definition, parameters
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being specified by names used in the definition. For example:
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; config("trace", 8),
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; define f(a,b) = a + b
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0: PARAMADDR a
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2: PARAMADDR b
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4: ADD
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5: RETURN
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f(a,b) defined
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; config("trace", 8),
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; define f(a,b) = a + b
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0: PARAMADDR a
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2: PARAMADDR b
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4: ADD
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5: RETURN
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f(a,b) defined
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The opcodes may also be displayed later using the show opcodes command;
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parameters will be specified by indices instead of by names. For example:
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; show opco f
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0: PARAMADDR 0
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2: PARAMADDR 1
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4: ADD
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5: RETURN
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; show opco f
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0: PARAMADDR 0
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2: PARAMADDR 1
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4: ADD
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5: RETURN
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When a function is defined by the statement mode, the opcodes normally
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include DEBUG opcodes which specify statement boundaries at which
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@@ -169,17 +169,17 @@ EXAMPLE
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; define f(a,b) = 2*a + b;
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; define g(alpha, beta)
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;; {
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;; local a, pi2;
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;; local a, pi2;
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;;
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;; pi2 = 2 * pi();
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;; a = sin(alpha % pi2);
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;; if (a > 0.0) {
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;; return a*beta;
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;; }
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;; if (beta > 0.0) {
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;; a *= cos(-beta % pi2);
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;; }
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;; return a;
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;; pi2 = 2 * pi();
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;; a = sin(alpha % pi2);
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;; if (a > 0.0) {
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;; return a*beta;
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;; }
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;; if (beta > 0.0) {
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;; a *= cos(-beta % pi2);
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;; }
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;; return a;
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;; }
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LIMITS
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@@ -192,7 +192,7 @@ SEE ALSO
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param, variable, undefine, show
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## Copyright (C) 2000-2006,2021 David I. Bell, Landon Curt Noll
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## and Ernest Bowen
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## and Ernest Bowen
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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@@ -200,7 +200,7 @@ SEE ALSO
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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@@ -209,8 +209,8 @@ SEE ALSO
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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##
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## Under source code control: 1991/07/21 04:37:18
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## File existed as early as: 1991
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## Under source code control: 1991/07/21 04:37:18
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## File existed as early as: 1991
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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