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Contents → STANDARD MACRO GUIDE → Scan Macros → Customizing Scan Output

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To allow you to customize the scan headers and the information saved with each data point, several macros are available for redefinition. Their default definitions are:

def Pheader ''          # Printer header
def Fheader ''          # File header
def Plabel  '"'        # Printer/Video column labels
def Pout    '"'        # Printer/Video output at each point
def Flabel  '"'        # File column labels
def Fout    '"'        # File output at each point

Four of these must be defined as strings -- in the default case, null strings. Here are examples of how these macros might save temperature set point and measurement information on the output devices.

def Pheader 'printf("\n Setpoint = %g (%g C)\n", TEMP_SP,DEGC_SP)'
def Fheader '_cols++;printf("#X %gKohm (%gC)\n",TEMP_SP,DEGC_SP)'
def Plabel  'sprintf("%7.7s %7.7s ","T-set","T-degC")'
def Pout    'sprintf("%7.5g %7.5g ",TEMP_SP,DEGC)'
def Flabel  '"DegC  "'
def Fout    'sprintf("%g ",DEGC)'

The Pheader and Fheader macros must print newline-terminated lines. More than one line is permitted, however. Besides adding scan header information to the data file, Fheader also adjusts the value of the global variable _cols, which is used to indicate the number of data columns in the data file. In the example shown, the Flabel and Fout definitions add one column to the data file, so _cols is incremented by one. The Plabel and Pout macros add columns to the printer (and screen) output. The columns in Flabel should be separated by double spaces (the data file convention). The columns in the other headers should be separated by single spaces. In each case, the spaces come after the label.

The Ftail macro is available for adding scan results to the data file at the conclusion of a scan. By default Ftail is defined as nothing,

def Ftail   ''          # File tail

You might define it to be

def Ftail   'printf("#R %d %g %g %g %g %g %g\n", \
              SCAN_N, pl_xMAX, pl_MAX, pl_FWHM, pl_CWHM, pl_COM, pl_SUM);'

where the values being printed are from the pl_anal() function described on page ##. The #R characters begin the data file control line for scan results.

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