SEXP CHMfactor_updown(SEXP upd, SEXP C_, SEXP L_)
{
CHM_FR L = AS_CHM_FR(L_), Lcp;
CHM_SP C = AS_CHM_SP__(C_);
int update = asInteger(upd);
R_CheckStack();
Lcp = cholmod_copy_factor(L, &c);
int r = cholmod_updown(update, C, Lcp, &c);
if(!r) error(_("cholmod_updown() returned %d"), r);
return chm_factor_to_SEXP(Lcp, 1);
}
int main(int argc, char *argv[])
{
char *name = "main";
char *seperator = "**********************************************************";
// Setup the data structure with parameters of the problem
switch (argc)
{
case 1:
printf("No input file specified. Using dia1P.inp\n");
dia1P_initialize("dia1P.inp",name);
break;
case 2:
dia1P_initialize(argv[1],name);
break;
default:
dia1P_errHandler(errCode_TooManyArguments,name,name,errMesg_TooManyArguments);
}
// Print the problem to make sure
dia1P_printPD(name);
/* The prefix M_ is used for components that can be reused in several
failure simulations. For example, it is not necessary to compute
the first stiffness matrix M_M or its decomposition M_L for each
failure simulation. On the other hand, the matrix of fuse strengths,
S, needs to be repopulated every time.
*/
/* START REUSABLE COMPONENTS DECLARATIONS */
// Stiffness matrix M
cholmod_sparse *M_M;
// J = M_V2C*V; where J = current flowing into the bottom nodes,
// and V = vector of voltages of all nodes
cholmod_sparse *M_V2C;
// Voltages at top and bottom nodes
cholmod_sparse *M_vTop, *M_vBot;
// Cholesky factor of the stiffness matrix M
cholmod_factor *M_L;
// Cholmod Common object
cholmod_common Common;
// Basic scalars, one and minus one
double one [2] = {1,0}, m1 [2] = {-1,0} ;
/* END REUSABLE COMPONENTS DECLARATIONS */
/* START REUSABLE COMPONENTS INITIALIZATIONS */
// Start cholmod, and the cholmod_common object
cholmod_start(&Common);
// Populated the top and bottom node voltages
// Bottom row is "grounded", thus has zero
// voltage by convention.
// cholmod_spzeros(NRow,NCol,stype,xtype,*common)
M_vBot = cholmod_spzeros(pD.gridSize/2,1,0,CHOLMOD_REAL,&Common);
// The top row has voltage = 1. Since cholmod has no inbuild
// function to return a sparse vector of all ones (makes sense)
// so we first create a dense vector of ones and then
// convert it to a sparse vector
{ // limit the scope of temporary variables
cholmod_dense *temp;
temp = cholmod_ones(pD.gridSize/2,1,CHOLMOD_REAL,&Common);
M_vTop = cholmod_dense_to_sparse(temp,1,&Common);
cholmod_free_dense(&temp,&Common);
}
// Polulate voltage to current matrix and check it for
// consistency
M_V2C = dia1P_voltageToCurrentMatrix(&Common,name);
cholmod_check_sparse(M_V2C,&Common);
// Populate stiffness matrix
M_M = dia1P_stiffnessMatrix(&Common,name);
// Check it for consistency
cholmod_check_sparse(M_M,&Common);
// Analyze and factorise the stiffness matrix
M_L = cholmod_analyze(M_M,&Common);
cholmod_factorize(M_M,M_L,&Common);
// Check the factor for consistency
cholmod_check_factor(M_L,&Common);
/* END REUSABLE COMPONENTS INITIALIZATIONS */
// Depending on the mode in which the program is run
// various levels of output are given to the user.
// The three modes implemented so far are:
// 0: Silent,
// 1: minimal,
// 2: normal
// 3: verbose
switch (pD.diagMode)
{
case 0:
break;
case 1:
fprintf(pD.diagFile,"NSim\tnF\t\tnAv\t\tV\t\tC\n");
fflush(pD.diagFile);
break;
case 2:
break;
case 3:
fprintf(pD.diagFile,"Initial Stiffness Matrix\n");
cholmod_write_sparse(pD.diagFile,M_M,NULL,NULL,&Common);
fflush(pD.diagFile);
break;
default:
dia1P_errHandler(errCode_UnknownDiagMode,name,name,errMesg_UnknownDiagMode);
}
/* START MAIN SIMULATIONS LOOP */
// Number of simulations performed
int countSims = 0;
while (countSims < pD.NSim)
{
/* START LOOP COMPONENTS DECLARATIONS */
// The sampleFailed flag remains zeros as long as
// the sample is not broken (a spanning crack is
// not encountered; it becomes 1 otherwise.
int sampleFailed = 0;
// nFail counts the number of bonds snapped till
// sample failure
int nFail = 0;
// Cholesky factor L will hold the cholesky factor that will be updated after each bond snapping
cholmod_factor *L;
// Vector of random fuse strengths
double *S;
// Matrix that maps the node voltages to the vector of
// currents flowing into the bottom nodes.
// This matrix is update after every bond breaking
cholmod_sparse *V2C;
// Load vector b. This vector is to be updated after
// every bond breaking
cholmod_sparse *b;
// A data structure that will store information about the
// most recently failed bond
dia1P_failureSite FD;
// A data structure that will store information about the
// sequence of failures in a particular simulation
dia1P_brokenBonds *BB;
/* END LOOP COMPONENTS DECLARATIONS */
/* START LOOP COMPONENTS INITIALIZATIONS */
// Copy the pre-calculated cholesky factor into the local
// cholesky factor
L = cholmod_copy_factor(M_L,&Common);
// Populate fuse strength vector
S = dia1P_strengthVector(name);
//FILE *pf = fopen("16.S","r"); S = cholmod_read_sparse(pf,&Common); fclose(pf);
// Copy the initial voltage to current matrix
V2C = cholmod_copy_sparse(M_V2C,&Common);
// Initialize the structure for keeping records of broken bonds
BB = dia1P_initializeBrokenBonds(name);
// Polulate the load vector b
b = dia1P_loadVector(&Common,name);
// Check to ensure consistency...
cholmod_check_sparse(b,&Common);
/* END LOOP COMPONENTS INITIALIZATIONS */
// Write diagonistic output as requested
switch (pD.diagMode)
{
case 0: break;
case 1: break;
case 2:
fprintf(pD.diagFile,"%s\n",seperator);
fprintf(pD.diagFile,"Starting Simulation Number %d\n",countSims+1);
fprintf(pD.diagFile,"I\t\tJ\t\tV\t\tC\n");
fflush(pD.diagFile);
break;
case 3:
fprintf(pD.diagFile,"%s\n",seperator);
fprintf(pD.diagFile,"Starting Simulation Number %d\n",countSims+1);
fprintf(pD.diagFile,"Matrix of Random Fuse Strengths:\n");
{
int count = 0;
for(count = 0; count < (pD.gridSize)*(pD.gridSize); count++)
{
int n1, n2;
dia1P_getNodeNumbers(&n1,&n2,count,name);
fprintf(pD.diagFile,"%d\t%d\t%G\n",n1,n2,S[count]);
}
fprintf(pD.diagFile,"\n");
}
//cholmod_write_sparse(pD.diagFile,S,NULL,NULL,&Common);
fflush(pD.diagFile);
break;
default: dia1P_errHandler(errCode_UnknownDiagMode,name,name,errMesg_UnknownDiagMode);
}
while(sampleFailed == 0)
{
/* START INNER LOOP COMPONENTS INITIALIZATIONS */
// Vector x will hold the unknown voltages
cholmod_sparse *x;
// Vectors VNode_s and VNode_d hold the full set
// of node voltages (knowns appended to the calculated unknowns)
cholmod_sparse *VNode_s;
cholmod_dense *VNode_d;
// This vector will be used to update the stiffness matrix M
// as M_new = M_old - stiffUpdate*transpose(stiffUpdate)
// Ofcouse, M is not update, rather its cholesky factor L is
cholmod_sparse *stiffUpdate;
// This vector updates the load vector as
// b_new = b_old + loadUpdate
cholmod_sparse *loadUpdate;
// This vector is needed for internal cholmod use.
// We L = PMP^T, where P is the permuation matrix.
// Thus, if U updates M, then PU will update L.
// uper = PU.
cholmod_sparse *uper;
/* END INNER LOOP COMPONENTS INITIALIZATIONS */
// Solve for the unknown voltages
x = cholmod_spsolve(CHOLMOD_A,L,b,&Common);
// Append the known vectors top and the bottom
// row voltages to x to construct the complete
// vector of voltages.
{ // Limit the score of temporary variables
cholmod_sparse *temp1;
temp1 = cholmod_vertcat(M_vBot,x,1,&Common);
VNode_s = cholmod_vertcat(temp1,M_vTop,1,&Common);
cholmod_free_sparse(&temp1,&Common);
}
// Check if the sample is broken, if it is then
// we are done
if(dia1P_isBroken(VNode_s,V2C,&Common,name))
{
sampleFailed = 1;
{
int count = 0;
for(count = 0; count < BB->nFail; count++)
{
fprintf(pD.outFile,"%d\t%d\t%G\t%G\t%G\n",BB->i[count]+1,BB->j[count]+1,BB->v[count],BB->c[count],BB->bondStrength[count]);
}
fprintf(pD.outFile,"%d\t%d\t%G\t%G\t%G\n",0,0,0.f,0.f,0.f);
}
}
else
{ // If the sample is not broken yet, then we need to
// to find which bond will be snapped next.
// Increment the number of failed bonds, since we know
// that one is going to snap
nFail++;
// Make a dense vector of voltages
VNode_d = cholmod_sparse_to_dense(VNode_s,&Common);
// Find which bond to break and store the information
// in the data structure FD.
dia1P_bondToSnap(S,VNode_d,VNode_s,V2C,BB,&FD,&Common,name);
// Update the data structure BB, which stores the entire
// sequence of broken bonds
dia1P_updateBrokenBonds(BB,&FD,name);
// Update the voltage to current matrix.
// This matrix will change only if a fuse connected to the
// bottom edge is blown.
dia1P_updateVoltageToCurrentMatrix(V2C,&FD,&Common,name);
// Find the vector to update the stiffness matrix.
// This vector is never empty, it has either 1 or 2 nonzero components
// depending on weather a boundary node is involved in the snapping or not
stiffUpdate = dia1P_stiffnessUpdateVector(&FD,&Common,name);
// Find the vector to update the load vector.
// This vector is non-zero only if a fuse connected to the
// top edge is blown.
loadUpdate = dia1P_loadUpdateVector(&FD,&Common,name);
// Update the load vector
{ // Limit the score of temporary variables
cholmod_sparse *temp;
temp = cholmod_copy_sparse(b,&Common);
// Free the current memory occupied by b before reallocating
cholmod_free_sparse(&b,&Common);
// Reallocate b
b = cholmod_add(temp,loadUpdate,one,one,1,0,&Common);
// Free temp
cholmod_free_sparse(&temp,&Common);
}
// Calculate the permuted update vector for updating the cholesky factor
uper = cholmod_submatrix(stiffUpdate,L->Perm,L->n,NULL,-1,1,1,&Common);
// update (downdate) the cholesky factor
cholmod_updown(0,uper,L,&Common);
// Write appropriate diagnostic output
switch (pD.diagMode)
{
case 0: break;
case 1: break;
case 2:
fprintf(pD.diagFile,"%d\t\t%d\t\t%.3f\t%.3f\n",FD.node1+1,FD.node2+1,FD.fVol,FD.fCur);
break;
case 3:
fprintf(pD.diagFile,"\nPass No. %d\nUnknown Node Voltages:\n",nFail);
cholmod_write_sparse(pD.diagFile,x,NULL,NULL,&Common);
fprintf(pD.diagFile,"\nSnapped Bond: \nI\t\tJ\t\tV\t\tC\n");
fprintf(pD.diagFile,"%d\t\t%d\t\t%.3f\t%.3f\n\n",FD.node1+1,FD.node2+1,FD.fVol,FD.fCur);
fprintf(pD.diagFile,"\nStiffNess Update Vector\n");
cholmod_write_sparse(pD.diagFile,stiffUpdate,NULL,NULL,&Common);
fprintf(pD.diagFile,"\nLoad Update Vector\n");
cholmod_write_sparse(pD.diagFile,loadUpdate,NULL,NULL,&Common);
break;
default: dia1P_errHandler(errCode_UnknownDiagMode,name,name,errMesg_UnknownDiagMode);
}
//Free memory
cholmod_free_dense(&VNode_d,&Common);
cholmod_free_sparse(&stiffUpdate,&Common);
cholmod_free_sparse(&loadUpdate,&Common);
cholmod_free_sparse(&uper,&Common);
}//ESLE
cholmod_free_sparse(&x,&Common);
cholmod_free_sparse(&VNode_s,&Common);
}//ELIHW, loop for nth simulation
// Free memory
free(S);
cholmod_free_sparse(&b,&Common);
cholmod_free_sparse(&V2C,&Common);
cholmod_free_factor(&L,&Common);
dia1P_freeBrokenBonds(&BB,name);
countSims++;
}//ELIHW, main loop for NSim simulations
// This completes the requested set of NSim simulations.
// Free memory
cholmod_free_sparse(&M_M,&Common);
cholmod_free_sparse(&M_V2C,&Common);
cholmod_free_sparse(&M_vBot,&Common);
cholmod_free_sparse(&M_vTop,&Common);
cholmod_free_factor(&M_L,&Common);
// Close dia1P and cholmod
dia1P_finish(name);
// cholmod_print_common("FuseNet Statistics",&Common);
cholmod_finish(&Common);
return(0);
}