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568 CHAPTER 13 The optional third argument, 'REPORT_HEADER', is used when you wish to place a header string on the report. You can refer to the LOOPOLE model in the Samples folder for an example of a model that uses the @SOLU command @WRITE( ‘TEXT1’|VALUE1[, …, ‘TEXTN’|VALUEN]) The @WRITE statement is the primary tool you’ll use for displaying output in calc sections. @WRITE can display both text and variable values. Text strings are delimited with single or double-quotes. All output will be directed to the screen unless @DIVERT (discussed below) is used to route output to a file. @WRITE is useful for both debugging your calc section code and for generating custom reports. As an example, the following product mix model uses @WRITE statements in a calc section to construct a custom report: MODEL: [PROFIT] MAX = 200 * WS + 300 * NC; [CHASSIS1] WS <= 60; [CHASSIS2] NC <= 40; [DRIVES] WS + 2 * NC <= 120; CALC: @SOLVE(); @WRITE( 'Total profit = ', PROFIT, @NEWLINE( 1)); @WRITE( 'Production:', @NEWLINE( 1)); @WRITE( ' WS = ', WS, @NEWLINE( 1), ' NC = ', NC, @NEWLINE( 1), 'Total units = ', WS + NC, @NEWLINE( 2) ); @WRITE( 'Dual analysis:', @NEWLINE( 1), ' Chassis1: ', @DUAL( CHASSIS1), @NEWLINE( 1), ' Chassis2: ', @DUAL( CHASSIS2), @NEWLINE( 1), ' Drives: ', @DUAL( DRIVES), @NEWLINE( 1) ); ENDCALC END
