36 lines
615 B
Awk
Executable File
36 lines
615 B
Awk
Executable File
#!/usr/bin/awk -f
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BEGIN { firstline = 1 }
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# Calculates the first derivative of columns 2 and 3 wrt column 1
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$0 !~ /^#/ {
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t = $1
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x = $2
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y = $3
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if (firstline == 1) {
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old_tx = old_ty = t
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old_x = x
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old_y = y
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dy_dt = dx_dt = 0
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firstline = 0
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} else {
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dx = old_x - x
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dy = old_y - y
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if ( dx != 0) {
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dt = old_tx - t
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dx_dt = dx/dt
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old_tx = t
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old_x = x
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}
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if ( dy != 0) {
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dt = old_ty - t
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dy_dt = dy/dt
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old_ty = t
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old_y = y
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}
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if ( dx != 0 || dy != 0 ) {
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print t, " ", x, " ", y, " ", dx_dt, " ", dy_dt
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}
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}
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}
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