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chrisfen |
1845 |
program convolve |
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character*80 junk, option |
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integer nargs, iargc, npts, maxpts, i, j |
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parameter (maxpts=10000) |
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double precision width, x(maxpts), y(maxpts), myX, myY, dx, convol |
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double precision instrument_gaussian, deltaX |
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external iargc, instrument_gaussian |
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nargs = iargc() |
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if (nargs.ne.2) then |
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write(0,*) 'This program is a filter for convoluting a data file by' |
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write(0,*) 'a gaussian instrument function of a particular width.' |
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write(0,*) |
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write(0,*) 'Sample usage:' |
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write(0,*) ' convolve -w 0.5 < file.dat > new.dat' |
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write(0,*) |
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write(0,*) 'The -w flag tells the program that the argument that' |
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write(0,*) 'follows is the width of the gaussian instrument function' |
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write(0,*) 'in the same units as the x column in the data file.' |
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stop |
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endif |
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call getarg(1,junk) |
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read(junk,*) option |
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if (option.ne.'-w') then |
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write(0,*) 'Your first argument is not a -w! What do you want to do?' |
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stop |
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endif |
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call getarg(2,junk) |
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read(junk,*) width |
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npts = 1 |
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do while (.true.) |
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read(5,*,end=40) myX, myY |
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x(npts) = myX |
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y(npts) = myY |
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npts = npts + 1 |
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end do |
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40 continue |
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deltaX = x(2) - x(1) |
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do i = 1, npts-1 |
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convol = 0.0d0 |
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do j = 1, npts-1 |
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dx = x(j) - x(i) |
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convol = convol + y(j)*instrument_gaussian(dx, width) * deltaX |
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enddo |
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convol = convol |
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write(*,*) x(i), convol |
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enddo |
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end program convolve |
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double precision function instrument_gaussian(x, sigma) |
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double precision pi, sigma, x |
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pi = 4.0d0 * datan(1.0d0) |
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instrument_gaussian = exp(- x*x / (2.0d0 * sigma * sigma)) / (sigma * sqrt(2.0d0 * pi)) |
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return |
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end function instrument_gaussian |
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