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### 9 Installation and Auxiliary Functions

#### 9.1 Requirements

This version of RCWA needs at least GAP 4.8.7 in 64-bit mode, ResClasses 4.7.0, GRAPE 4.7 [Soi16], Polycyclic 2.11 [EHN13], FR 2.2.1 [Bar15], GAPDoc 1.5.1 [LN12], and Utils 0.40 [GKW16]. With possible exception of the most recent version of ResClasses, all needed packages are already present in an up-to-date standard GAP installation. The RCWA package is completely written in the GAP language and can be used on all platforms for which GAP is available.

#### 9.2 Installation

Like any other GAP package, RCWA is usually installed in the pkg subdirectory of the GAP distribution. This is accomplished by extracting the distribution file in this directory. If you have done this, you can load the package as usual via LoadPackage( "rcwa" );.

#### 9.3 Building the manual

The following routine is a development tool. As all files it generates are included in the distribution file anyway, users will not need it.

##### 9.3-1 RCWABuildManual
 ‣ RCWABuildManual( ) ( function )

Returns: nothing.

This function builds the manual of the RCWA package in the file formats LaTeX, PDF, HTML and ASCII text. This is accomplished using the GAPDoc package by Frank Lübeck and Max Neunhöffer. Building the manual is possible only on UNIX-type systems and requires PDFLaTeX.

#### 9.4 The testing routines

##### 9.4-1 RCWATestInstall
 ‣ RCWATestInstall( ) ( function )

Returns: true if no errors were found, and false otherwise.

Performs a nontrivial computation to check whether an installation of RCWA appears to work. Errors, i.e. differences to the correct results of the test computation, are reported. The processed test file is pkg/rcwa/tst/testinstall.tst.

##### 9.4-2 RCWATestAll
 ‣ RCWATestAll( ) ( function )

Returns: true if no errors were found, and false otherwise.

Runs the full test suite of the RCWA package. Any differences to the supposed results of the test computations are reported. The processed test files are in the tst subdirectory of the package directory.

Please note that the test suite is a tool for developing. The tests are deliberately very volatile to allow to spot possible problems of any kind also in other packages or in the GAP Library. For this reason you may see reports of differences which simply reflect improved methods in other packages or in the GAP Library (for example an object may already know more of its attributes or properties than it is expected to, or an object may be represented in a better way), or which are caused by changes of the way certain objects are printed, and which are therefore harmless. However if the correct and the actual output look different mathematically or if you see error messages or if GAP crashes, then something went wrong. Also, reports about significantly increased run times of individual commands as well as run times of test files which are much longer than the predicted times shown may indicate a problem.

##### 9.4-3 RCWATestExamples
 ‣ RCWATestExamples( ) ( function )

Returns: nothing.

Runs all examples in the manual of the RCWA package, and reports any differences between the actual output and the output printed in the manual.

#### 9.5 The Info class of the package

##### 9.5-1 InfoRCWA
 ‣ InfoRCWA ( info class )

This is the Info class of the RCWA package. See section Info Functions in the GAP Reference Manual for a description of the Info mechanism. For convenience: RCWAInfo(n) is a shorthand for SetInfoLevel(InfoRCWA,n).

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