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void usage_yagi(char *exefile)
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fprintf(stderr,"\nYagi-Uda antenna analysis programs, version %.2f\n", version());
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fprintf(stderr,"Written by Dr. David Kirkby Ph.D. G8WRB (email:david.kirkby@onetel.net)\n");
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fprintf(stderr, "\nUSAGE: %s [-dhps] filename \n\n", exefile);
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fprintf(stderr, "Where options are:\n");
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fprintf(stderr, " -d Display bar-graphs, proportional to element currents\n");
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fprintf(stderr, " -h Print this help screen\n");
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fprintf(stderr, " -p Print Z matrix to screen.\n");
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fprintf(stderr, " -s Suppress diagnostic output\n");
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fprintf(stderr, "'yagi' computes the currents at the centre of of each element of an antenna \ndescribed in 'filename', where 'filename' was created by 'input' or 'first'.\n");
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fprintf(stderr, "After running 'yagi filename' type 'output filename'\n");