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<a name="Gentran-Option-Variables"></a>
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<a name="Gentran-Option-Variables-1"></a>
<h3 class="section">61.4 Gentran Option Variables</h3>
<a name="Item_003a-gentran_002fdefvr_002fgentranlang"></a><dl>
<dt><a name="index-gentranlang"></a>Option variable: <strong>gentranlang</strong></dt>
<dd><p>Default: fortran
</p>
<p>Selects the target numerical language. Currently, gentranlang must be
fortran, ratfor, or c. Note that symbols entered in Maxima are
case-sensitive. gentranlang should not be set to FORTRAN, RATFOR or C.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002ffortlinelen"></a><dl>
<dt><a name="index-fortlinelen"></a>Option variable: <strong>fortlinelen</strong></dt>
<dd><p>default: 72
</p>
<p>Maximum number of characters printed on each line of generated FORTRAN
code.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fminfortlinelen"></a><dl>
<dt><a name="index-minfortlinelen"></a>Option variable: <strong>minfortlinelen</strong></dt>
<dd><p>Default: 40
</p>
<p>Minimum number of characters printed on each line of generated FORTRAN
code.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002ffortcurrind"></a><dl>
<dt><a name="index-fortcurrind"></a>Option variable: <strong>fortcurrind</strong></dt>
<dd><p>Default: 0
</p>
<p>Number of blank spaces printed at the beginning of each line of
generated FORTRAN code (after column 6).
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fratlinelen"></a><dl>
<dt><a name="index-ratlinelen"></a>Option variable: <strong>ratlinelen</strong></dt>
<dd><p>Default: 80
</p>
<p>Maximum number of characters printed on each line of generated Ratfor
code.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fclinelen"></a><dl>
<dt><a name="index-clinelen"></a>Option variable: <strong>clinelen</strong></dt>
<dd><p>Default: 80
</p>
<p>Maximum number of characters printed on each line of generated ’C’ code.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fminclinelen"></a><dl>
<dt><a name="index-minclinelen"></a>Option variable: <strong>minclinelen</strong></dt>
<dd><p>Default: 40
</p>
<p>Minimum number of characters printed on each line of generated ’C’ code.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fccurind"></a><dl>
<dt><a name="index-ccurind"></a>Option variable: <strong>ccurind</strong></dt>
<dd><p>Default: 0
</p>
<p>Number of blank spaces printed at the beginning of each line of
generated’C’ code.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002ftablen"></a><dl>
<dt><a name="index-tablen"></a>Option variable: <strong>tablen</strong></dt>
<dd><p>Default: 4
</p>
<p>Number of blank spaces printed for each new level of indentation.
(Automatic indentation can be turned off by setting this variable to 0.)
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fgenfloat"></a><dl>
<dt><a name="index-genfloat"></a>Option variable: <strong>genfloat</strong></dt>
<dd><p>Default: false
</p>
<p>When set to true (or any non-false value), causes integers in generated
numerical code to be converted to floating point numbers, except in the
following places: array subscripts, exponents, and initial, final, and
step values in do-loops. An exception (for compatibility with Macsyma
2.4) is that numbers in exponentials (with base %e only) are
double-floated even when genfloat is false.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fdblfloat"></a><dl>
<dt><a name="index-dblfloat"></a>Option variable: <strong>dblfloat</strong></dt>
<dd><p>Default: <strong>false</strong> If dblfloat is set to
true, floating point numbers in gentran output in implementations (such
as Windows Maxima under CLISP) in which float and double-float are the
same will be printed as *.d0. In implementations in which float and
double-float are different, floats will be coerced to double-float
before being printed.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fgentranseg"></a><dl>
<dt><a name="index-gentranseg"></a>Option variable: <strong>gentranseg</strong></dt>
<dd><p>Default: <strong>true</strong>
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fmaxexpprintlen"></a><dl>
<dt><a name="index-maxexpprintlen"></a>Option variable: <strong>maxexpprintlen</strong></dt>
<dd><p>Default: 800
</p>
<p>When <strong>gentranseg</strong> is true (or any non-false value), causes
Gentran to "segment" large expressions into subexpressions of manageable
size. The segmentation facility generates a sequence of assignment
statements, each of which assigns a subexpression to an automatically
generated temporary variable name. This sequence is generated in such a
way that temporary variables are re-used as soon as possible, thereby
keeping the number of automatically generated variables to a minimum.
The maximum allowable expression size can be controlled by setting the
<strong>maxexpprintlen</strong> variable to the maximum number of characters
allowed in an expression printed in the target numerical language
(excluding spaces and other whitespace characters automatically printed
by the formatter). When the segmentation routine generates temporary
variables, it places type declarations in the symbol table for those
variables if possible. It uses the following rules to determine their
type:
</p>
<p>1. If the type of the variable to which the large expression is being
assigned is already known (i.e., has been declared by the user via a
TYPE form), then the temporary variables will be declared to be of that
same type. 2. If the global variable <strong>tempvartype</strong> has a
non-false value, then the temporary variables are declared to be of that
type. 3. Otherwise, the variables are not declared unless
<strong>implicit</strong> has been set to <strong>true</strong>.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fgentranopt"></a><dl>
<dt><a name="index-gentranopt"></a>Option variable: <strong>gentranopt</strong></dt>
<dd><p>Default: <strong>false</strong>
</p>
<p>When set to true (or any non-false value), causes Gentran to replace
each block of straightline code by an optimized sequence of assignments
obtained from the Maxima optimize command. (The optimize command takes
an expression and replaces common subexpressions by temporary variable
names. It returns the resulting assignment statement, preceded by
common-subexpression-to-temporary-variable assignments.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002ftempvarname"></a><dl>
<dt><a name="index-tempvarname"></a>Option variable: <strong>tempvarname</strong></dt>
<dd><p>Default: <strong>’t</strong>
</p>
<p>Name used as the prefix when generating temporary variable names.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002foptimvarname"></a><dl>
<dt><a name="index-optimvarname"></a>Option variable: <strong>optimvarname</strong></dt>
<dd><p>default: <strong>’u</strong>
</p>
<p>is the preface used
to generate temporary file names produced by the optimizer when
<strong>gentranopt</strong> is <strong>true</strong>. When both gentranseg and
gentranopt are true, the optimizer generates temporary file names using
<strong>optimvarname</strong> while the segmentation routine uses
<strong>tempvarname</strong> preventing conflict.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002ftempvarnum"></a><dl>
<dt><a name="index-tempvarnum"></a>Option variable: <strong>tempvarnum</strong></dt>
<dd><p>Default: 0
</p>
<p>Number appended onto tempvarname to create a temporary variable name. If
the temporary variable name resulting from appending tempvarnum onto the
end of tempvarname has already been generated and still holds a useful
value or has a different type than requested, then the number is
incremented until one is found that was not previously generated or does
not still hold a significant value or a different type.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002ftempvartype"></a><dl>
<dt><a name="index-tempvartype"></a>Option variable: <strong>tempvartype</strong></dt>
<dd><p>Default: <strong>false</strong>
</p>
<p>Target language variable type (e.g., INTEGER, REAL*8, FLOAT, etc.) used
as a default for automatically generated variables whose type cannot be
determined otherwise. If tempvartype is false, then generated temporary
variables whose type cannot be determined are not automatically
declared.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fimplicit"></a><dl>
<dt><a name="index-implicit-1"></a>Option variable: <strong>implicit</strong></dt>
<dd><p>Default: <strong>false</strong>
</p>
<p>If implicit is set to <strong>true</strong> temporary variables are assigned
their implicit type according to Fortran rules based on the initial
letter of the name. If gendecs is on, this results in printed type
declarations.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fgentranparser"></a><dl>
<dt><a name="index-gentranparser"></a>Option variable: <strong>gentranparser</strong></dt>
<dd><p>Default: <strong>false</strong>
</p>
<p>If gentranparser is set to <strong>true</strong> Maxima forms input to gentran
will be parsed and an error will be produced if an expression cannot be
translated. Otherwise, untranslatable expressions may generate anomalous
output, sometimes containing explicit calls to Maxima functions.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fgenstmtno"></a><dl>
<dt><a name="index-genstmtno"></a>Option variable: <strong>genstmtno</strong></dt>
<dd><p>Default: 25000
</p>
<p>Number used when a statement number must be generated. Note: it is the
user’s responsibility to make sure this number will not clash with
statement numbers in template files.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fgenstmtincr"></a><dl>
<dt><a name="index-genstmtincr"></a>Option variable: <strong>genstmtincr</strong></dt>
<dd><p>Default: 1
</p>
<p>number by which genstmtno is incremented each time a new statement
number is generated.
</p></dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fusefortcomplex"></a><dl>
<dt><a name="index-usefortcomplex"></a>Option variable: <strong>usefortcomplex</strong></dt>
<dd><p>Default: <strong>false</strong>
</p>
<p>If usefortcomplex is true, real numbers in expressions declared to be
complex by <em>type(complex,…)</em> will be printed in Fortran
complex number format <em>(realpart,0.0)</em>. This is a purely syntactic
device and does not carry out any complex calculations.
</p>
</dd></dl>
<a name="Item_003a-gentran_002fnode_002fGentran-Evaluation-Forms"></a><hr>
<div class="header">
<p>
Next: <a href="maxima_282.html#Gentran-Evaluation-Forms" accesskey="n" rel="next">Gentran Evaluation Forms</a>, Previous: <a href="maxima_280.html#Gentran-Mode-Switches" accesskey="p" rel="previous">Gentran Mode Switches</a>, Up: <a href="maxima_277.html#gentran_002dpkg" accesskey="u" rel="up">gentran-pkg</a> [<a href="maxima_toc.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="maxima_423.html#Function-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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