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diff --git a/man/man3/funparamput.3 b/man/man3/funparamput.3 new file mode 100644 index 0000000..db90dcc --- /dev/null +++ b/man/man3/funparamput.3 @@ -0,0 +1,256 @@ +.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32 +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. 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Normally, the header is associated with the \s-1FITS\s0 +extension that you opened with \fB\f(BIFunOpen()\fB\fR. +However, you can use \fIFunInfoPut()\fR to specify that use of the primary +header. In particular, if you set the \s-1FUN_PRIMARYHEADER\s0 parameter to +1, then the primary header is used for all parameter access until the +value is reset to 0. For example: +.PP +.Vb 5 +\& int val; +\& FunParamPuti(fun, "NAXIS1", 0, 10, NULL, 1); # current header +\& val=1; +\& FunInfoPut(fun, FUN_PRIMARYHEADER, &val, 0); # switch to ... +\& FunParamPuti(fun, "NAXIS1", 0, 10, NULL, 1); # primary header +.Ve +.PP +(You also can use the deprecated \s-1FUN_PRIMARY\s0 macro, to access +parameters from the primary header.) +.PP +The second argument is the \fBname\fR of the parameter. ( +In accordance with \s-1FITS\s0 standards, the special names \fB\s-1COMMENT\s0\fR +and \fB\s-1HISTORY\s0\fR, as well as blank names, are output without the \*(L"= \*(R" +value indicator in columns 9 and 10. +.PP +The third \fBn\fR argument, if non\-zero, is an integer that will be +added as a suffix to the parameter name. This makes it easy to use a +simple loop to process parameters having the same root name. For +example, to set the values of \s-1TLMIN\s0 and \s-1TLMAX\s0 for each column in a +binary table, you can use: +.PP +.Vb 4 +\& for(i=0; i<got; i++){ +\& FunParamPutd(fun, "TLMIN", i+1, tlmin[i], 7, "min column val", 1); +\& FunParamPutd(fun, "TLMAX", i+1, tlmax[i], 7, "max column val", 1); +\& } +.Ve +.PP +The fourth \fBdefval\fR argument is the value to set. Note that the +data type of this argument is different for each specific +\&\fIFunParamPut()\fR call. The \fBcomm\fR argument is the comment +string to add to this header parameter. Its value can be \s-1NULL\s0. The +final \fBappend\fR argument determines whether the parameter is added +to the header if it does not exist. If set to a non-zero value, the +header parameter will be appended to the header if it does not exist. +If set to 0, the value will only be used to change an existing parameter. +.PP +Note that the double precision routine \fIFunParamPutd()\fR supports an +extra \fBprec\fR argument after the \fBvalue\fR argument, in order +to specify the precision when converting the double value to \s-1ASCII\s0. In +general a 20.[prec] format is used (since 20 characters are alloted to +a floating point number in \s-1FITS\s0) as follows: if the double value being +put to the header is less than 0.1 or greater than or equal to +10**(20\-2\-[prec]), then \f(CW%20\fR.[prec]e format is used (i.e., scientific +notation); otherwise \f(CW%20\fR.[prec]f format is used (i.e., numeric +notation). +.PP +As a rule, parameters should be set before writing the table or image. +It is, however, possible to update the value of an \fBexisting\fR +parameter after writing an image or table (but not to add a new +one). Such updating only works if the parameter already exists and if +the output file is seekable, i.e. if it is a disk file or is stdout +being redirected to a disk file. +.PP +It is possible to add a new parameter to a header after the data has +been written, but only if space has previously been reserved. To reserve +space, add a blank parameter whose value is the name of the parameter you +eventually will update. Then, when writing the new parameter, specify a +value of 2 for the append flag. The parameter writing routine will +first look to update an existing parameter, as usual. If an existing +parameter is not found, an appropriately-valued blank parameter will be +searched for and replaced. For example: +.PP +.Vb 8 +\& /* add blank card to be used as a place holder for IPAR1 update */ +\& FunParamPuts(fun, NULL, 0, "IPAR1", "INTEGER Param", 0); +\& ... +\& /* write header and data */ +\& FunTableRowPut(fun, events, got, 0, NULL); +\& ... +\& /* update param in file after writing data -- note append = 2 here */ +\& FunParamPuti(fun, "IPAR", 1, 400, "INTEGER Param", 2); +.Ve +.PP +The parameter routines return a 1 if the routine was successful and a 0 on +failure. In general, the major reason for failure is that you did not +set the append argument to a non-zero value and the parameter did not +already exist in the file. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +See funtools(7) for a list of Funtools help pages |