UNU-1OP(1)

💅 unu-1op — bestie edition ✨

okay so you know unu? this is the unary operation girlie of the family. she lives in the User Commands section of the manual, section 1, and she is so good at her one job. one nrrd in, one nrrd out, one operation applied to literally every value. no cap. 🎀

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✨ NAME ✨

unu-1op — unary operation on a nrrd 🦋

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🌸 SYNOPSIS 🌸

unu 1op <operator> [-s,--seed <seed>] [-t,--type <type>] [-i,--input
<nin>] [-o,--output <nout>]

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💖 DESCRIPTION 💖

Unary operation on a nrrd. that's it. that's the whole vibe. 💅

• Uses nrrdArithUnaryOp (the actual math machinery behind the scenes, she's iconic)

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👑 OPTIONS 👑

• operator — the unary operator, bestie. Possibilities include:
  • “-”: negative (multiply by -1.0) 🙈
  • “r”: reciprocal (1.0/value)
  • “sin”, “cos”, “tan”, “asin”, “acos”, “atan”: same as in C 🧚
  • “exp”, “log”, “log10”: same as in C
  • “log1p”, “expm1”: accurate log(x+1) and exp(x)-1 ✨
  • “log2”: log base 2
  • “sqrt”, “cbrt”, “ceil”, “floor”: same as in C 🌸
  • “erf”: error function (integral of Gaussian) 🔥
  • “rup”, “rdn”: round up or down to integral value
  • “abs”: absolute value 💜
  • “sgn”: -1, 0, 1 if value is <0, ==0, or >0
  • “exists”: 1 iff not NaN or +/-Inf, 0 otherwise
  • “rand”: random value in [0.0,1.0), no relation to input 💀
  • “nrand”: random sample from normal distribution with mean 0.0 and stdvi 1.0, no relation to input 😭
  • “if”: if input is non-zero, 1, else 0
  • “0”: output always 0
  • “1”: output always 1 👑
• -s <seed> , --seed <seed> — seed value for the RNG, for rand and nrand, so that you can get repeatable results between runs. or, by not using this option, the RNG seeding will be based on the current time (string). so like, chaos mode by default, deterministic mode if you ask nicely 🎀
• -t <type> , --type <type> — convert input nrrd to this type prior to doing operation. useful when the desired output is float (e.g., with log1p) but the input is integral. by default (not using this option), the types of the input nrrds are left unchanged. she's not gonna touch your types unless you tell her to, fr fr
• -i <nin> , --input <nin> — input nrrd 🦋
• -o <nout> , --output <nout> — output nrrd (string); default: “-” 💅

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🌈 SEE ALSO 🌈

unu(1) ✨

abs(3), acos(3), asin(3), atan(3), cbrt(3), ceil(3), cos(3), erf(3), exp(3), expm1(3), fabs(3), floor(3), isfinite(3), log(3), log10(3), log1p(3), log2(3), rand(3), sin(3), sqrt(3), tan(3) 🧚💖

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okay one (1) warning-ish thing bestie: rand and nrand genuinely do not care about your input at all. zero relation. if you want the same numbers twice, use -s/--seed. periodt. 💅

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and that's the whole page, bestie!! this one's from the UNU-1OP(1) manual, August 2021 edition, and yeah she's still sitting in section 1 of User Commands where she belongs. mwah 💖🎀🦋✨