JAVA code
Case 1: Using built-in constants
import org.mariuszgromada.math.mxparser.*;
...
Expression e = new Expression("pi+e");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());
Res: pi+e = 5.859874482048838
Case 2: Estimating Moon gravitational acceleration
import org.mariuszgromada.math.mxparser.*;
...
Expression e = new Expression("( [G.] * [Moon-M] / [Moon-R]^2 ) * ( [m] / [s]^2 )");
mXparser.consolePrintln("Res: " + e.getExpressionString() + " = " + e.calculate());
[mXparser-v.4.0.0] Res: ( [G.] * [Moon-M] / [Moon-R]^2 ) * ( [m] / [s]^2 ) = 1.624734971584136
Case 3: Getting list of constants
import org.mariuszgromada.math.mxparser.*;
...
Expression e = new Expression();
mXparser.consolePrintln(e.getHelp("constant"));
[mXparser-v.4.0.0] Help content: 183. pi <Constant Value> Pi, Archimedes' constant or Ludolph's number 184. e <Constant Value> Napier's constant, or Euler's number, base of Natural logarithm 185. [gam] <Constant Value> Euler-Mascheroni constant 186. [phi] <Constant Value> Golden ratio 187. [PN] <Constant Value> Plastic constant 188. [B*] <Constant Value> Embree-Trefethen constant 189. [F'd] <Constant Value> Feigenbaum constant alfa 190. [F'a] <Constant Value> Feigenbaum constant delta 191. [C2] <Constant Value> Twin prime constant 192. [M1] <Constant Value> Meissel-Mertens constant 193. [B2] <Constant Value> Brun's constant for twin primes 194. [B4] <Constant Value> Brun's constant for prime quadruplets 195. [BN'L] <Constant Value> de Bruijn-Newman constant 196. [Kat] <Constant Value> Catalan's constant 197. [K*] <Constant Value> Landau-Ramanujan constant 198. [K.] <Constant Value> Viswanath's constant 199. [B'L] <Constant Value> Legendre's constant 200. [RS'm] <Constant Value> Ramanujan-Soldner constant 201. [EB'e] <Constant Value> Erdos-Borwein constant 202. [Bern] <Constant Value> Bernstein's constant 203. [GKW'l] <Constant Value> Gauss-Kuzmin-Wirsing constant 204. [HSM's] <Constant Value> Hafner-Sarnak-McCurley constant 205. [lm] <Constant Value> Golomb-Dickman constant 206. [Cah] <Constant Value> Cahen's constant 207. [Ll] <Constant Value> Laplace limit 208. [AG] <Constant Value> Alladi-Grinstead constant 209. [L*] <Constant Value> Lengyel's constant 210. [L.] <Constant Value> Levy's constant 211. [Dz3] <Constant Value> Apery's constant 212. [A3n] <Constant Value> Mills' constant 213. [Bh] <Constant Value> Backhouse's constant 214. [Pt] <Constant Value> Porter's constant 215. [L2] <Constant Value> Lieb's square ice constant 216. [Nv] <Constant Value> Niven's constant 217. [Ks] <Constant Value> Sierpinski's constant 218. [Kh] <Constant Value> Khinchin's constant 219. [FR] <Constant Value> Fransen-Robinson constant 220. [La] <Constant Value> Landau's constant 221. [P2] <Constant Value> Parabolic constant 222. [Om] <Constant Value> Omega constant 223. [MRB] <Constant Value> MRB constant 224. [li2] <Constant Value> (2.3) li(2) - logarithmic integral function at x=2 225. [EG] <Constant Value> (2.3) Gompertz constant 226. [ c] <Constant Value> (4.0) <Physical Constant> Light speed in vacuum [m/s] (m=1, s=1) 227. [G.] <Constant Value> (4.0) <Physical Constant> Gravitational constant (m=1, kg=1, s=1)] 228. [g] <Constant Value> (4.0) <Physical Constant> Gravitational acceleration on Earth [m/s^2] (m=1, s=1) 229. [hP] <Constant Value> (4.0) <Physical Constant> Planck constant (m=1, kg=1, s=1) 230. [h-] <Constant Value> (4.0) <Physical Constant> Reduced Planck constant / Dirac constant (m=1, kg=1, s=1)] 231. [lP] <Constant Value> (4.0) <Physical Constant> Planck length [m] (m=1) 232. [mP] <Constant Value> (4.0) <Physical Constant> Planck mass [kg] (kg=1) 233. [tP] <Constant Value> (4.0) <Physical Constant> Planck time [s] (s=1) 234. [ly] <Constant Value> (4.0) <Astronomical Constant> Light year [m] (m=1) 235. [au] <Constant Value> (4.0) <Astronomical Constant> Astronomical unit [m] (m=1) 236. [pc] <Constant Value> (4.0) <Astronomical Constant> Parsec [m] (m=1) 237. [kpc] <Constant Value> (4.0) <Astronomical Constant> Kiloparsec [m] (m=1) 238. [Earth-R-eq] <Constant Value> (4.0) <Astronomical Constant> Earth equatorial radius [m] (m=1) 239. [Earth-R-po] <Constant Value> (4.0) <Astronomical Constant> Earth polar radius [m] (m=1) 240. [Earth-R] <Constant Value> (4.0) <Astronomical Constant> Earth mean radius (m=1) 241. [Earth-M] <Constant Value> (4.0) <Astronomical Constant> Earth mass [kg] (kg=1) 242. [Earth-D] <Constant Value> (4.0) <Astronomical Constant> Earth-Sun distance - semi major axis [m] (m=1) 243. [Moon-R] <Constant Value> (4.0) <Astronomical Constant> Moon mean radius [m] (m=1) 244. [Moon-M] <Constant Value> (4.0) <Astronomical Constant> Moon mass [kg] (kg=1) 245. [Moon-D] <Constant Value> (4.0) <Astronomical Constant> Moon-Earth distance - semi major axis [m] (m=1) 246. [Solar-R] <Constant Value> (4.0) <Astronomical Constant> Solar mean radius [m] (m=1) 247. [Solar-M] <Constant Value> (4.0) <Astronomical Constant> Solar mass [kg] (kg=1) 248. [Mercury-R] <Constant Value> (4.0) <Astronomical Constant> Mercury mean radius [m] (m=1) 249. [Mercury-M] <Constant Value> (4.0) <Astronomical Constant> Mercury mass [kg] (kg=1) 250. [Mercury-D] <Constant Value> (4.0) <Astronomical Constant> Mercury-Sun distance - semi major axis [m] (m=1) 251. [Venus-R] <Constant Value> (4.0) <Astronomical Constant> Venus mean radius [m] (m=1) 252. [Venus-M] <Constant Value> (4.0) <Astronomical Constant> Venus mass [kg] (kg=1) 253. [Venus-D] <Constant Value> (4.0) <Astronomical Constant> Venus-Sun distance - semi major axis [m] (m=1) 254. [Mars-R] <Constant Value> (4.0) <Astronomical Constant> Mars mean radius [m] (m=1) 255. [Mars-M] <Constant Value> (4.0) <Astronomical Constant> Mars mass [kg] (kg=1) 256. [Mars-D] <Constant Value> (4.0) <Astronomical Constant> Mars-Sun distance - semi major axis [m] (m=1) 257. [Jupiter-R] <Constant Value> (4.0) <Astronomical Constant> Jupiter mean radius [m] (m=1) 258. [Jupiter-M] <Constant Value> (4.0) <Astronomical Constant> Jupiter mass [kg] (kg=1) 259. [Jupiter-D] <Constant Value> (4.0) <Astronomical Constant> Jupiter-Sun distance - semi major axis [m] (m=1) 260. [Saturn-R] <Constant Value> (4.0) <Astronomical Constant> Saturn mean radius [m] (m=1) 261. [Saturn-M] <Constant Value> (4.0) <Astronomical Constant> Saturn mass [kg] (kg=1) 262. [Saturn-D] <Constant Value> (4.0) <Astronomical Constant> Saturn-Sun distance - semi major axis [m] (m=1) 263. [Uranus-R] <Constant Value> (4.0) <Astronomical Constant> Uranus mean radius [m] (m=1) 264. [Uranus-M] <Constant Value> (4.0) <Astronomical Constant> Uranus mass [kg] (kg=1) 265. [Uranus-D] <Constant Value> (4.0) <Astronomical Constant> Uranus-Sun distance - semi major axis [m] (m=1) 266. [Neptune-R] <Constant Value> (4.0) <Astronomical Constant> Neptune mean radius [m] (m=1) 267. [Neptune-M] <Constant Value> (4.0) <Astronomical Constant> Neptune mass [kg] (kg=1) 268. [Neptune-D] <Constant Value> (4.0) <Astronomical Constant> Neptune-Sun distance - semi major axis [m] (m=1)
Enjoy! 🙂
Best regards,
Mariusz Gromada
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