t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT...

28
T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6 i) hloud J4u Elu, led wxk o( 41 lSe. i,r e*\ t4Jas (uu bnf*n R) ani, li 4qey ou* ha, I Wri{e lr*-levnl a,nguary, x gr,6Me lapc 4t a+ ca,, 6e h&r &red \tui-/a fr usi,- ,,fi trr*{-,Ms rF t> Ir 5 INIYrA t- N0TE 9 M. P. wAN b s EprEM FeR 20 ts 9u& os *c{) qnl rFer-l"ran(),

Transcript of t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT...

Page 1: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

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########## R function: sumRecipsViaCpp #########

t. Fo-r obtaining the sum of the reciprocals# of the first "n" integers. This vbrsion# uses Rcpp and C++.

# Last changed = L0 SEp 2019

lppFunction("double sumRecipsViaCpp(int n){double total = 0;for(inti=L;i<-n;++i){ total += t.0/i;)return totat i

)")End of sumRecipsViaCpp #########

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Page 11: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

########## R function : cornf,lowerViaCpp

t. f?, solving the Cornftower probtem via C++ using# the R packages Rcpp and RcppArmadillo.

# Last changed: t0 SEp 2019

cppFunction("double cornflowerviacpp(armar :mat& A, arma: :vec& b)t// Declare and set all non-input variables:arma::vec eigvals;arma::mat OmegaL = A;int n = b.n_elem;

// larry out the toop over i=L,...'tl// (note C++ array indexing from 0 to n_1):for(inti=0;i<n;i++){

// }btain eigenvalues of symmetrised 0megaL:

eigvals = eig_sym(0.5x(Omegal + 0megaL.t( ) ) ) ;

// Update Omegal matrix:

- Omega1 = (Omega1 + eigvals.max0xb(i)).iO;) - \-"--\"

return trace(0mega1);

)", depends=" RcppArmad itlo,, )

############ End of cornflowerViaCpp #########

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Page 13: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

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Page 14: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

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Page 17: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

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Page 18: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

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Page 19: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

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Page 20: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

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Page 21: t-rc R PA gCUSSrc Nmatt-wand.utsacademics.info/webRCPPDG/WandRcppPack... · T t-rc R cpp PA LWA GT DI gCUSSrc N G Rr: ltP PARI 1 WAr*tU l,tfStopY l,tr if H I tot^J ,\l ESS o F R ovfRcoMIAJ6

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double mYReciP(int i){

return t'0/ t;) doubte myRecip(int i);

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double totat = 0;double currRecip;

/x Now add the first n reciprocals: x/for(inti=L;i<-n;++i)

,t, {

currReciP = myRecip(i) ;total += currRecip;)return total;

)

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