| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | ||
| 3 | SLEPc - Scalable Library for Eigenvalue Problem Computations | ||
| 4 | Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain | ||
| 5 | |||
| 6 | This file is part of SLEPc. | ||
| 7 | SLEPc is distributed under a 2-clause BSD license (see LICENSE). | ||
| 8 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | ||
| 9 | */ | ||
| 10 | /* | ||
| 11 | BV bi-orthogonalization routines | ||
| 12 | */ | ||
| 13 | |||
| 14 | #include <slepc/private/bvimpl.h> /*I "slepcbv.h" I*/ | ||
| 15 | |||
| 16 | /* | ||
| 17 | BVBiorthogonalizeMGS1 - Compute one step of Modified Gram-Schmidt bi-orthogonalization | ||
| 18 | */ | ||
| 19 | 1344 | static PetscErrorCode BVBiorthogonalizeMGS1(BV V,BV W,Vec v,PetscScalar *h,PetscScalar *c) | |
| 20 | { | ||
| 21 | 1344 | PetscInt i; | |
| 22 | 1344 | PetscScalar dot; | |
| 23 | 1344 | Vec vi,wi; | |
| 24 | |||
| 25 |
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1344 | PetscFunctionBegin; |
| 26 |
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5376 | for (i=-V->nc;i<V->k;i++) { |
| 27 |
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4032 | PetscCall(BVGetColumn(W,i,&wi)); |
| 28 | /* h_i = (v, w_i) */ | ||
| 29 |
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4032 | PetscCall(VecDot(v,wi,&dot)); |
| 30 |
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4032 | PetscCall(BVRestoreColumn(W,i,&wi)); |
| 31 | /* v <- v - h_i v_i */ | ||
| 32 |
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5376 | PetscCall(BV_SetValue(V,i,0,c,dot)); |
| 33 |
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4032 | PetscCall(BVGetColumn(V,i,&vi)); |
| 34 |
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4032 | PetscCall(VecAXPY(v,-dot,vi)); |
| 35 |
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4032 | PetscCall(BVRestoreColumn(V,i,&vi)); |
| 36 | } | ||
| 37 |
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1792 | PetscCall(BV_AddCoefficients(V,V->k,h,c)); |
| 38 |
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224 | PetscFunctionReturn(PETSC_SUCCESS); |
| 39 | } | ||
| 40 | |||
| 41 | /* | ||
| 42 | BVBiorthogonalizeCGS1 - Compute one step of CGS bi-orthogonalization: v = (I-V*W')*v | ||
| 43 | */ | ||
| 44 | 18712 | static PetscErrorCode BVBiorthogonalizeCGS1(BV V,BV W,Vec v,PetscScalar *h,PetscScalar *c) | |
| 45 | { | ||
| 46 |
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18712 | PetscFunctionBegin; |
| 47 | /* h = W'*v */ | ||
| 48 |
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18712 | PetscCall(BVDotVec(W,v,c)); |
| 49 | |||
| 50 | /* v = v - V h */ | ||
| 51 |
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18712 | PetscCall(BVMultVec(V,-1.0,1.0,v,c)); |
| 52 | |||
| 53 |
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26140 | PetscCall(BV_AddCoefficients(V,V->k,h,c)); |
| 54 |
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3680 | PetscFunctionReturn(PETSC_SUCCESS); |
| 55 | } | ||
| 56 | |||
| 57 | #define BVBiorthogonalizeGS1(a,b,c,d,e) ((V->orthog_type==BV_ORTHOG_MGS)?BVBiorthogonalizeMGS1:BVBiorthogonalizeCGS1)(a,b,c,d,e) | ||
| 58 | |||
| 59 | /* | ||
| 60 | BVBiorthogonalizeGS - Orthogonalize with (classical or modified) Gram-Schmidt | ||
| 61 | |||
| 62 | V, W - the two basis vectors objects | ||
| 63 | v - the vector to bi-orthogonalize | ||
| 64 | */ | ||
| 65 | 10028 | static PetscErrorCode BVBiorthogonalizeGS(BV V,BV W,Vec v) | |
| 66 | { | ||
| 67 | 10028 | PetscScalar *h,*c; | |
| 68 | |||
| 69 |
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10028 | PetscFunctionBegin; |
| 70 | 10028 | h = V->h; | |
| 71 | 10028 | c = V->c; | |
| 72 |
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13966 | PetscCall(BV_CleanCoefficients(V,V->k,h)); |
| 73 |
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19384 | PetscCall(BVBiorthogonalizeGS1(V,W,v,h,c)); |
| 74 |
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19384 | if (V->orthog_ref!=BV_ORTHOG_REFINE_NEVER) PetscCall(BVBiorthogonalizeGS1(V,W,v,h,c)); |
| 75 |
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1952 | PetscFunctionReturn(PETSC_SUCCESS); |
| 76 | } | ||
| 77 | |||
| 78 | /*@ | ||
| 79 | BVBiorthogonalizeColumn - Bi-orthogonalize a column of two `BV` objects. | ||
| 80 | |||
| 81 | Collective | ||
| 82 | |||
| 83 | Input Parameters: | ||
| 84 | + V - first basis vectors context | ||
| 85 | . W - second basis vectors context | ||
| 86 | - j - index of column to be bi-orthonormalized | ||
| 87 | |||
| 88 | Notes: | ||
| 89 | This function bi-orthogonalizes vectors $v_j$, $w_j$ against $W_{0:j-1}$, | ||
| 90 | and $V_{0:j-1}$, respectively, so that $W_{0:j}^*V_{0:j}$ is diagonal. | ||
| 91 | |||
| 92 | Level: advanced | ||
| 93 | |||
| 94 | .seealso: [](sec:bv), `BVOrthogonalizeColumn()`, `BVBiorthonormalizeColumn()` | ||
| 95 | @*/ | ||
| 96 | 4157 | PetscErrorCode BVBiorthogonalizeColumn(BV V,BV W,PetscInt j) | |
| 97 | { | ||
| 98 | 4157 | PetscInt ksavev,lsavev,ksavew,lsavew; | |
| 99 | 4157 | Vec y,z; | |
| 100 | |||
| 101 |
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4157 | PetscFunctionBegin; |
| 102 |
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4157 | PetscValidHeaderSpecific(V,BV_CLASSID,1); |
| 103 |
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4157 | PetscValidHeaderSpecific(W,BV_CLASSID,2); |
| 104 |
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4157 | PetscValidLogicalCollectiveInt(V,j,3); |
| 105 |
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4157 | PetscValidType(V,1); |
| 106 |
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4157 | BVCheckSizes(V,1); |
| 107 |
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4157 | PetscValidType(W,2); |
| 108 |
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4157 | BVCheckSizes(W,2); |
| 109 |
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4157 | PetscCheckSameTypeAndComm(V,1,W,2); |
| 110 |
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4157 | PetscCheck(j>=0,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_OUTOFRANGE,"Index j must be non-negative"); |
| 111 |
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4157 | PetscCheck(j<V->m,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_OUTOFRANGE,"Index j=%" PetscInt_FMT " but V only has %" PetscInt_FMT " columns",j,V->m); |
| 112 |
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4157 | PetscCheck(j<W->m,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_OUTOFRANGE,"Index j=%" PetscInt_FMT " but W only has %" PetscInt_FMT " columns",j,W->m); |
| 113 |
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4157 | PetscCheck(V->n==W->n,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_INCOMP,"Mismatching local dimension V %" PetscInt_FMT ", W %" PetscInt_FMT,V->n,W->n); |
| 114 |
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4157 | PetscCheck(!V->matrix && !W->matrix,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_WRONGSTATE,"V,W must not have an inner product matrix"); |
| 115 |
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4157 | PetscCheck(!V->nc && !W->nc,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_WRONGSTATE,"V,W cannot have different number of constraints"); |
| 116 |
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4157 | PetscCheck(!V->ops->gramschmidt && !W->ops->gramschmidt,PetscObjectComm((PetscObject)V),PETSC_ERR_SUP,"Object has a special GS function"); |
| 117 | |||
| 118 | /* bi-orthogonalize */ | ||
| 119 |
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4157 | PetscCall(PetscLogEventBegin(BV_OrthogonalizeVec,V,0,0,0)); |
| 120 | 4157 | ksavev = V->k; | |
| 121 | 4157 | lsavev = V->l; | |
| 122 | 4157 | ksavew = W->k; | |
| 123 | 4157 | lsavew = W->l; | |
| 124 | 4157 | V->k = j; | |
| 125 | 4157 | V->l = -V->nc; /* must also bi-orthogonalize against constraints and leading columns */ | |
| 126 | 4157 | W->k = j; | |
| 127 | 4157 | W->l = -W->nc; | |
| 128 |
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4157 | PetscCall(BV_AllocateCoeffs(V)); |
| 129 |
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4157 | PetscCall(BV_AllocateCoeffs(W)); |
| 130 |
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4157 | PetscCall(BVGetColumn(V,j,&y)); |
| 131 |
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4157 | PetscCall(BVBiorthogonalizeGS(V,W,y)); |
| 132 |
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4157 | PetscCall(BVRestoreColumn(V,j,&y)); |
| 133 |
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4157 | PetscCall(BVGetColumn(W,j,&z)); |
| 134 |
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4157 | PetscCall(BVBiorthogonalizeGS(W,V,z)); |
| 135 |
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4157 | PetscCall(BVRestoreColumn(W,j,&z)); |
| 136 | 4157 | V->k = ksavev; | |
| 137 | 4157 | V->l = lsavev; | |
| 138 | 4157 | W->k = ksavew; | |
| 139 | 4157 | W->l = lsavew; | |
| 140 |
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4157 | PetscCall(PetscLogEventEnd(BV_OrthogonalizeVec,V,0,0,0)); |
| 141 |
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4157 | PetscCall(PetscObjectStateIncrease((PetscObject)V)); |
| 142 |
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4157 | PetscCall(PetscObjectStateIncrease((PetscObject)W)); |
| 143 |
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2878 | PetscFunctionReturn(PETSC_SUCCESS); |
| 144 | } | ||
| 145 | |||
| 146 | /*@ | ||
| 147 | BVBiorthonormalizeColumn - Bi-orthonormalize a column of two `BV` objects. | ||
| 148 | |||
| 149 | Collective | ||
| 150 | |||
| 151 | Input Parameters: | ||
| 152 | + V - first basis vectors context | ||
| 153 | . W - second basis vectors context | ||
| 154 | - j - index of column to be bi-orthonormalized | ||
| 155 | |||
| 156 | Output Parameter: | ||
| 157 | . delta - (optional) value used for normalization | ||
| 158 | |||
| 159 | Notes: | ||
| 160 | This function first bi-orthogonalizes vectors $v_j$, $w_j$ against $W_{0:j-1}$, | ||
| 161 | and $V_{0:j-1}$, respectively. Then, it scales the vectors with $1/\delta$, so | ||
| 162 | that the resulting vectors satisfy $w_j^*v_j = 1$. | ||
| 163 | |||
| 164 | Level: advanced | ||
| 165 | |||
| 166 | .seealso: [](sec:bv), `BVOrthonormalizeColumn()`, `BVBiorthogonalizeColumn()` | ||
| 167 | @*/ | ||
| 168 | 857 | PetscErrorCode BVBiorthonormalizeColumn(BV V,BV W,PetscInt j,PetscReal *delta) | |
| 169 | { | ||
| 170 | 857 | PetscScalar alpha; | |
| 171 | 857 | PetscReal deltat; | |
| 172 | 857 | PetscInt ksavev,lsavev,ksavew,lsavew; | |
| 173 | 857 | Vec y,z; | |
| 174 | |||
| 175 |
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857 | PetscFunctionBegin; |
| 176 |
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857 | PetscValidHeaderSpecific(V,BV_CLASSID,1); |
| 177 |
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857 | PetscValidHeaderSpecific(W,BV_CLASSID,2); |
| 178 |
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857 | PetscValidLogicalCollectiveInt(V,j,3); |
| 179 |
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857 | PetscValidType(V,1); |
| 180 |
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857 | BVCheckSizes(V,1); |
| 181 |
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857 | PetscValidType(W,2); |
| 182 |
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857 | BVCheckSizes(W,2); |
| 183 |
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857 | PetscCheckSameTypeAndComm(V,1,W,2); |
| 184 |
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857 | PetscCheck(j>=0,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_OUTOFRANGE,"Index j must be non-negative"); |
| 185 |
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857 | PetscCheck(j<V->m,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_OUTOFRANGE,"Index j=%" PetscInt_FMT " but V only has %" PetscInt_FMT " columns",j,V->m); |
| 186 |
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857 | PetscCheck(j<W->m,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_OUTOFRANGE,"Index j=%" PetscInt_FMT " but W only has %" PetscInt_FMT " columns",j,W->m); |
| 187 |
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857 | PetscCheck(V->n==W->n,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_INCOMP,"Mismatching local dimension V %" PetscInt_FMT ", W %" PetscInt_FMT,V->n,W->n); |
| 188 |
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857 | PetscCheck(!V->matrix && !W->matrix,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_WRONGSTATE,"V,W must not have an inner product matrix"); |
| 189 |
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857 | PetscCheck(!V->nc && !W->nc,PetscObjectComm((PetscObject)V),PETSC_ERR_ARG_WRONGSTATE,"V,W cannot have different number of constraints"); |
| 190 |
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857 | PetscCheck(!V->ops->gramschmidt && !W->ops->gramschmidt,PetscObjectComm((PetscObject)V),PETSC_ERR_SUP,"Object has a special GS function"); |
| 191 | |||
| 192 | /* bi-orthogonalize */ | ||
| 193 |
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857 | PetscCall(PetscLogEventBegin(BV_OrthogonalizeVec,V,0,0,0)); |
| 194 | 857 | ksavev = V->k; | |
| 195 | 857 | lsavev = V->l; | |
| 196 | 857 | ksavew = W->k; | |
| 197 | 857 | lsavew = W->l; | |
| 198 | 857 | V->k = j; | |
| 199 | 857 | V->l = -V->nc; /* must also bi-orthogonalize against constraints and leading columns */ | |
| 200 | 857 | W->k = j; | |
| 201 | 857 | W->l = -W->nc; | |
| 202 |
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857 | PetscCall(BV_AllocateCoeffs(V)); |
| 203 |
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857 | PetscCall(BV_AllocateCoeffs(W)); |
| 204 |
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857 | PetscCall(BVGetColumn(V,j,&y)); |
| 205 |
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857 | PetscCall(BVBiorthogonalizeGS(V,W,y)); |
| 206 |
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857 | PetscCall(BVRestoreColumn(V,j,&y)); |
| 207 |
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857 | PetscCall(BVGetColumn(W,j,&z)); |
| 208 |
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857 | PetscCall(BVBiorthogonalizeGS(W,V,z)); |
| 209 |
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857 | PetscCall(BVRestoreColumn(W,j,&z)); |
| 210 | 857 | V->k = ksavev; | |
| 211 | 857 | V->l = lsavev; | |
| 212 | 857 | W->k = ksavew; | |
| 213 | 857 | W->l = lsavew; | |
| 214 |
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857 | PetscCall(PetscLogEventEnd(BV_OrthogonalizeVec,V,0,0,0)); |
| 215 | |||
| 216 | /* scale */ | ||
| 217 |
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857 | PetscCall(PetscLogEventBegin(BV_Scale,V,0,0,0)); |
| 218 |
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857 | PetscCall(BVGetColumn(V,j,&y)); |
| 219 |
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857 | PetscCall(BVGetColumn(W,j,&z)); |
| 220 |
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857 | PetscCall(VecDot(z,y,&alpha)); |
| 221 |
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857 | PetscCall(BVRestoreColumn(V,j,&y)); |
| 222 |
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857 | PetscCall(BVRestoreColumn(W,j,&z)); |
| 223 | 857 | deltat = PetscSqrtReal(PetscAbsScalar(alpha)); | |
| 224 |
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857 | PetscUseTypeMethod(V,scale,j,1.0/PetscConj(alpha/deltat)); |
| 225 |
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857 | PetscUseTypeMethod(W,scale,j,1.0/deltat); |
| 226 |
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857 | PetscCall(PetscLogEventEnd(BV_Scale,V,0,0,0)); |
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857 | if (delta) *delta = deltat; |
| 228 |
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857 | PetscCall(PetscObjectStateIncrease((PetscObject)V)); |
| 229 |
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857 | PetscCall(PetscObjectStateIncrease((PetscObject)W)); |
| 230 |
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579 | PetscFunctionReturn(PETSC_SUCCESS); |
| 231 | } | ||
| 232 |