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9 Optimizing the Model for Code Generation /* Gain: '<Root>/Gain1' incorporates: * Inport: '<Root>/In1' * * Regarding '<Root>/Gain': * Gain value: 2.0 */ rtb_Gain1 = rtU.In1 * 2.0; /* Outport: '<Root>/Out1' incorporates: * Abs: '<Root>/Abs' */ rtY.Out1 = rt_ABS(rtb_Gain1); /* Outport: '<Root>/Out2' incorporates: * Trigonometry: '<Root>/Trigonometric Function' * Gain: '<Root>/Gain2' * Inport: '<Root>/In2' * * Regarding '<Root>/Gain2': * Gain value: 2.0 */ rtY.Out2 = sin((2.0 * rtU.In2)); } Using the S-Function API to Specify Input Expression Acceptance The S-Function API provides macros that let you: • Specify whether a block input should accept non-constant expressions (i.e. trivial or generic expressions). • Query whether a block input accepts non-constant expressions. By default, block inputs do not accept non-constant expressions. You should call the macros in your mdlSetWorkWidths function. The macros have the following arguments: • SimStruct *S: pointer to the block’s SimStruct. • int idx: zero-based index of the input port. • bool value: pass in TRUE if the port accepts input expressions; otherwise pass in FALSE. 9-18
