diff --git a/regtest/dimred/rt-smap-osample/Makefile b/regtest/dimred/rt-smap-osample/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..3703b27cea227aa053fb6d1d73f861e4384dbcee
--- /dev/null
+++ b/regtest/dimred/rt-smap-osample/Makefile
@@ -0,0 +1 @@
+include ../../scripts/test.make
diff --git a/regtest/dimred/rt-smap-osample/config b/regtest/dimred/rt-smap-osample/config
new file mode 100644
index 0000000000000000000000000000000000000000..bc4e14b1c2d401ec57fe18e4aaba972a0ee71644
--- /dev/null
+++ b/regtest/dimred/rt-smap-osample/config
@@ -0,0 +1,3 @@
+type=driver
+# this is to test a different name
+arg="--plumed plumed.dat --noatoms"
diff --git a/regtest/dimred/rt-smap-osample/plumed.dat b/regtest/dimred/rt-smap-osample/plumed.dat
new file mode 100644
index 0000000000000000000000000000000000000000..068d284a658c5e273dc95fe0022cbc3a2ad10c8a
--- /dev/null
+++ b/regtest/dimred/rt-smap-osample/plumed.dat
@@ -0,0 +1,22 @@
+d1: READ FILE=plumed.in VALUES=c1
+d2: READ FILE=plumed.in VALUES=c2
+d3: READ FILE=plumed.in VALUES=c3
+
+oo: EUCLIDEAN_DISSIMILARITIES ARG=d1,d2,d3 USE_ALL_DATA
+ll: LANDMARK_SELECT_STRIDE USE_OUTPUT_DATA_FROM=oo NLANDMARKS=250
+
+CLASSICAL_MDS ...
+ USE_OUTPUT_DATA_FROM=ll
+ NLOW_DIM=2
+ LABEL=mds
+... CLASSICAL_MDS
+
+SKETCHMAP_CONJGRAD ...
+ USE_OUTPUT_DATA_FROM=mds
+ HIGH_DIM_FUNCTION={SMAP R_0=4 A=3 B=2}
+ LOW_DIM_FUNCTION={SMAP R_0=4 A=1 B=2}
+ CGTOL=1E-4 LABEL=smap
+... SKETCHMAP_CONJGRAD
+
+pp: PROJECT_ALL_ANALYSIS_DATA PROJECTION=smap USE_OUTPUT_DATA_FROM=oo CGTOL=1E-3
+OUTPUT_ANALYSIS_DATA_TO_COLVAR USE_OUTPUT_DATA_FROM=pp FMT=%8.2f FILE=projections
diff --git a/regtest/dimred/rt-smap-osample/plumed.in b/regtest/dimred/rt-smap-osample/plumed.in
new file mode 100644
index 0000000000000000000000000000000000000000..1c96756a462fc47e3556ce87f26c0158dea1f4e5
--- /dev/null
+++ b/regtest/dimred/rt-smap-osample/plumed.in
@@ -0,0 +1,507 @@
+#! FIELDS time c1 c2 c3 c.bias x
+#! SET min_c1 -pi
+#! SET max_c1 pi
+#! SET min_c2 -pi
+#! SET max_c2 pi
+#! SET min_c3 -pi
+#! SET max_c3 pi
+1 -1.63647 -2.19448 1.145 19 1
+2 1.47231 0.983589 -2.05682 11 2
+3 1.47989 2.70527 1.23769 6 3
+4 -1.66607 1.28149 -0.842482 30 4
+5 -2.57117 -1.66954 -1.95307 6 5
+6 -1.75009 1.06779 2.29045 12 6
+7 0.552083 -1.96243 -1.59225 8 7
+8 1.42691 -0.474587 1.43612 6 8
+9 1.72338 -2.00472 2.97464 2 9
+10 1.89071 -1.7752 -0.0245318 3 10
+11 -1.29551 -3.10719 -1.36093 7 11
+12 0.0654693 1.3653 1.47119 12 12
+13 -1.42348 -1.2069 2.83669 4 13
+14 1.98618 1.57369 -0.28893 3 14
+15 -1.24978 -0.330908 -1.73867 6 15
+16 2.64491 1.30507 1.6579 8 16
+17 3.01208 2.00737 -1.77873 2 17
+18 2.92017 -1.75878 1.56299 6 18
+19 1.8789 -0.709893 -1.50219 12 19
+20 -0.0326084 -1.53443 1.57965 7 20
+21 0.0280411 1.65644 -1.22987 4 21
+22 -1.82688 2.15514 0.911059 7 22
+23 1.43649 2.81711 -1.39397 8 23
+24 -1.86112 -0.353627 1.31613 9 24
+25 -1.72389 -1.40666 -0.482592 7 25
+26 1.28044 1.66349 2.63232 6 26
+27 -1.22956 1.76731 -2.58239 2 27
+28 -1.04164 -1.82081 -2.14735 9 28
+29 1.47117 -1.9116 1.31689 18 29
+30 1.34394 0.884897 1.49173 23 30
+31 1.91058 -2.20125 -1.52227 11 31
+32 -1.977 0.824297 -2.0655 10 32
+33 -0.891642 2.06399 2.01779 6 33
+34 -1.37642 0.819211 1.09606 10 34
+35 -2.58168 1.94737 1.90133 8 35
+36 -0.541078 -1.31761 -1.16741 6 36
+37 -1.64394 3.14031 1.88571 6 37
+38 -2.22261 -1.64303 2.03879 17 38
+39 -2.09535 2.1275 -1.63039 9 39
+40 2.7014 -1.4336 -1.09538 3 40
+41 1.72741 1.9851 -2.57642 4 41
+42 1.08422 1.25062 -0.936592 13 42
+43 1.4905 -1.20877 -2.468 8 43
+44 -1.12808 -1.22831 1.63709 11 44
+45 1.2005 1.53337 0.515166 6 45
+46 2.2992 1.14057 -1.27738 4 46
+47 1.38347 -1.1783 2.29012 18 47
+48 1.29951 0.164676 -1.31851 7 48
+49 -1.07504 1.91924 -1.4454 22 49
+50 -1.89997 -2.25987 -1.29817 17 50
+51 1.2073 -1.36815 -1.04265 19 51
+52 -2.07319 -0.982366 -1.35099 10 52
+53 -0.994843 0.775998 -1.78413 5 53
+54 0.897226 1.88556 -1.99939 8 54
+55 -1.30664 1.69025 0.0148277 4 55
+56 0.953204 1.81632 1.62528 12 56
+57 -1.4296 -1.4063 0.552758 7 57
+58 -1.34139 -2.14991 2.09122 13 58
+59 -0.83184 1.68383 1.11277 8 59
+60 1.98763 2.01562 1.81554 12 60
+61 2.19586 -1.12566 1.74186 14 61
+62 1.84723 1.94637 -1.57797 23 62
+63 1.36218 -1.11518 0.717682 7 63
+64 1.15504 -2.7246 1.69724 5 64
+65 -2.23464 1.07777 1.4829 15 65
+66 -1.59746 -2.01002 -2.98904 3 66
+67 -2.2027 -1.31505 1.1635 15 67
+68 -2.15063 1.69416 -2.47704 3 68
+69 -2.78959 1.26451 -1.49435 5 69
+70 -1.43132 -1.05526 -2.50049 4 70
+71 2.05708 1.70377 0.947851 16 71
+72 2.01027 0.226763 1.52926 8 72
+73 1.56602 -2.10779 -2.40217 7 73
+74 0.92587 -1.21746 1.50768 19 74
+75 -1.671 2.85028 -2.0909 2 75
+76 -1.59495 1.67909 1.65932 26 76
+77 -1.81944 0.349547 -1.35265 2 77
+78 1.94921 -3.0354 -1.94266 5 78
+79 2.21765 -2.10399 1.92621 7 79
+80 2.19097 -1.45093 -2.02965 19 80
+81 -1.08339 -1.98184 -1.30493 19 81
+82 -1.79406 -0.881555 2.04358 11 82
+83 1.85927 1.2931 3.13794 6 83
+84 -1.72866 1.61997 2.9389 5 84
+85 -2.63929 -1.87572 -1.12806 3 85
+86 0.957133 -1.89722 2.16235 10 86
+87 1.29135 2.19124 -0.84659 4 87
+88 2.29316 -1.66207 1.00964 4 88
+89 -1.42978 -2.60048 -2.01651 4 89
+90 1.96159 -2.90094 1.611 9 90
+91 1.91366 -1.73615 -0.844004 9 91
+92 0.979138 -1.17623 -1.80628 7 92
+93 -1.72056 0.42656 1.78245 10 93
+94 -0.443805 1.7454 -1.92402 6 94
+95 -1.61635 -3.05639 1.08494 4 95
+96 -1.29194 2.53722 1.48399 14 96
+97 -0.953079 1.24863 1.88431 9 97
+98 -2.05528 -2.45779 1.80107 10 98
+99 -0.221246 2.10434 1.50952 2 99
+100 -0.182818 -1.60361 -1.81456 5 100
+101 -1.51945 2.05797 -0.784709 9 101
+102 1.37743 0.893437 2.28249 4 102
+103 1.28997 -1.33648 3.06037 3 103
+104 2.79069 -1.95302 -1.6802 4 104
+105 -0.833397 -1.91489 1.40003 9 105
+106 -0.923471 -1.03619 -1.83577 8 106
+107 -1.70938 -1.43348 -1.87475 34 107
+108 -1.73033 1.4039 -1.61141 32 108
+109 1.28195 -2.39583 -1.11096 4 109
+110 1.13983 1.56889 -2.84931 3 110
+111 1.28181 -1.84368 0.440356 6 111
+112 -2.11477 -1.46891 -2.52829 4 112
+113 -1.29032 -1.25282 -1.12249 19 113
+114 1.524 -0.149291 2.10372 3 114
+115 1.3711 -1.21953 -0.337645 1 115
+116 1.9697 1.05201 1.84027 26 116
+117 2.11172 0.609152 -1.74726 2 117
+118 2.38571 1.54293 -1.88175 16 118
+119 1.27072 -1.84433 -1.75532 26 119
+120 -3.10483 1.58317 1.24842 4 120
+121 -0.728453 1.42758 -1.03949 3 121
+122 2.91775 -1.03802 1.64277 3 122
+123 -2.34403 1.66186 1.02773 6 123
+124 1.1174 -0.529666 -1.3615 3 124
+125 1.34577 -2.57169 -1.89917 3 125
+126 0.855902 1.24457 1.10878 4 126
+127 -2.00568 1.85456 2.31326 13 127
+128 0.461747 1.36519 -1.78053 7 128
+129 -1.10835 -1.71029 -0.301155 2 129
+130 1.98188 1.4412 2.42983 9 130
+131 1.3738 2.02601 1.07898 14 131
+132 -3.12153 -1.12406 -1.52863 3 132
+133 0.973417 0.798397 -1.5984 7 133
+134 -1.02673 -1.58574 2.40129 9 134
+135 2.03247 -1.59806 2.37249 6 135
+136 0.813446 1.40205 2.1708 10 136
+137 -2.32255 -1.98138 0.993494 7 137
+138 1.5136 2.41477 2.13363 6 138
+139 1.7459 0.913934 0.928745 12 139
+140 1.29831 1.4599 -1.58554 18 140
+141 0.734143 -1.78676 1.16545 5 141
+142 2.52419 2.0284 1.38121 8 142
+143 -1.12957 -0.601763 1.34766 9 143
+144 -1.13036 2.53482 -1.7449 7 144
+145 1.32697 0.201305 1.43499 11 145
+146 -2.85856 -1.50355 1.17584 6 146
+147 -1.92607 1.45763 -0.237063 1 147
+148 0.256291 1.75664 1.99598 2 148
+149 -1.97437 3.11764 -1.38718 4 149
+150 1.72818 0.756881 -1.20324 4 150
+151 1.81925 -0.167488 -1.90989 2 151
+152 -1.31058 1.57911 2.38692 12 152
+153 -2.85523 -1.41343 1.93394 5 153
+154 1.83809 1.35882 0.355813 4 154
+155 -1.13911 1.39804 -2.01585 25 155
+156 1.58172 -2.15484 2.20519 16 156
+157 -1.38611 1.52142 0.66538 4 157
+158 0.939605 -1.6039 -2.32807 12 158
+159 -2.21134 1.63672 -1.18424 14 159
+160 -1.55332 2.19204 -2.17384 10 160
+161 2.95494 -1.45283 -2.09543 2 161
+162 -1.64581 2.51022 -1.31781 10 162
+163 1.58656 -1.28904 1.52897 36 163
+164 0.890351 2.18885 -1.40813 6 164
+165 0.460815 -1.34114 -1.37693 6 165
+166 -1.63773 -0.930138 1.07508 18 166
+167 3.07079 2.11058 1.77787 1 167
+168 -2.12373 0.936469 -1.35684 7 168
+169 -1.96809 -1.55174 2.98287 2 169
+170 1.94131 1.62799 -1.01131 14 170
+171 -0.356731 1.19078 -1.59029 7 171
+172 -0.562905 -1.2122 1.31197 6 172
+173 1.469 1.44797 1.95943 31 173
+174 -2.74106 1.32423 1.82692 2 174
+175 -1.61336 -1.6341 1.5005 25 175
+176 -0.547322 -1.72491 1.94823 8 176
+177 -1.89057 -1.65244 -1.0559 18 177
+178 1.1902 -1.94266 -2.89937 3 178
+179 1.35278 1.63704 -0.368613 4 179
+180 -1.59674 -1.85964 0.0817611 3 180
+181 -2.09646 2.27962 1.4727 16 181
+182 -1.63049 0.293356 -2.10417 2 182
+183 -2.58561 -1.9418 1.61349 8 183
+184 -1.37368 1.21401 -3.01211 4 184
+185 2.41502 2.05352 -1.32033 5 185
+186 -1.65359 -0.397261 -1.25734 4 186
+187 2.05413 -1.30195 -1.37123 25 187
+188 -1.0917 0.667381 1.68141 6 188
+189 1.88882 -1.00875 1.05123 15 189
+190 -1.37225 -0.0986316 1.76198 5 190
+191 1.7596 2.11873 -0.0697735 2 191
+192 -1.69138 -1.78744 2.46515 12 192
+193 1.70365 -1.20481 0.20202 3 193
+194 1.30232 2.95756 1.90761 3 194
+195 -1.83132 -0.514928 -1.84037 7 195
+196 -1.17625 -1.9681 0.594919 4 196
+197 1.3042 2.32893 -1.84336 9 197
+198 1.64679 -2.86704 -1.43248 15 198
+199 -1.12166 0.966943 -1.21242 8 199
+200 -1.7232 -2.11297 -2.25102 11 200
+201 1.4067 -2.03098 -0.631487 7 201
+202 2.01666 -1.12938 -0.788035 1 202
+203 2.84777 1.57539 -1.38398 7 203
+204 -2.52685 1.58713 -1.9253 8 204
+205 1.69438 1.575 1.42283 26 205
+206 -1.31651 1.99994 1.23064 23 206
+207 1.68562 1.28167 -2.51672 14 207
+208 -1.44011 2.25151 2.10433 11 208
+209 0.673274 1.59476 -1.16551 6 209
+210 -1.69821 1.08326 1.71046 32 210
+211 1.16972 2.43632 1.66434 8 211
+212 -0.957329 2.018 -2.00569 9 212
+213 1.5281 2.85818 -2.03355 3 213
+214 1.33166 -1.74366 2.63454 5 214
+215 0.739213 -2.12771 1.63546 5 215
+216 1.50361 -0.963834 -1.93453 19 216
+217 1.92337 1.22518 -1.74433 20 217
+218 1.95124 -2.39571 1.332 5 218
+219 -1.51682 -2.06112 -0.894555 8 219
+220 -1.82857 1.81966 0.220383 5 220
+221 -2.17786 1.44633 1.94678 24 221
+222 -1.27767 0.246225 -1.51505 9 222
+223 1.3753 2.18053 -2.98659 1 223
+224 0.842907 -1.12203 2.06827 4 224
+225 0.0249378 -1.78182 -1.31106 7 225
+226 -1.70368 1.43854 -2.22708 17 226
+227 3.10559 1.18474 -1.90401 1 227
+228 -1.78887 1.3869 1.04526 21 228
+229 2.10982 2.06559 -2.16377 3 229
+230 1.5777 1.07018 -0.733926 6 230
+231 1.4552 -3.02334 1.3289 7 231
+232 -2.19576 -1.84884 -1.58173 28 232
+233 1.71015 -1.78572 1.80864 27 233
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+253 1.97335 -1.53273 2.93209 2 253
+254 0.367958 1.85767 -1.59111 6 254
+255 -1.15703 1.32121 1.39576 16 255
+256 -1.50081 -1.49686 -2.87559 6 256
+257 -1.55128 -1.35238 2.11278 22 257
+258 -1.46456 -0.941254 -1.98034 13 258
+259 1.84793 1.82422 3.13693 1 259
+260 -1.75073 -1.05942 -0.936011 13 260
+261 -0.578486 -1.75229 -1.49389 11 261
+262 1.45095 -1.05183 -1.38561 27 262
+263 0.74543 1.08916 1.75316 4 263
+264 -1.99776 2.09104 -1.03131 8 264
+265 1.53117 -2.3224 1.71172 18 265
+266 1.65527 1.94653 2.40142 20 266
+267 1.02428 1.90168 2.13667 6 267
+268 1.21169 -3.12623 -1.74327 6 268
+269 -2.08477 -1.0033 1.62607 11 269
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+275 -1.2093 1.61278 -1.00596 13 275
+276 1.40803 1.7617 -1.10651 23 276
+277 1.66856 -1.63354 -1.50549 29 277
+278 1.42876 1.42131 0.961376 13 278
+279 1.803 -2.36747 -2.00076 8 279
+280 0.430302 -1.44004 1.38228 11 280
+281 2.2501 -1.88594 -1.31408 18 281
+282 -1.59007 -0.843835 -1.49908 15 282
+283 2.05874 1.27198 1.21295 17 283
+284 1.72611 2.37107 -1.33015 14 284
+285 1.58266 0.292343 1.00762 2 285
+286 1.87043 -1.53062 -2.558 5 286
+287 -0.998004 -0.822503 -1.38324 7 287
+288 1.22231 1.88409 -2.38679 8 288
+289 2.21923 1.65492 1.54965 14 289
+290 -2.15357 -1.69266 1.49391 22 290
+291 2.45356 -1.5485 1.4721 11 291
+292 -2.17979 -1.91459 -2.18913 11 292
+293 -2.03399 1.70456 -0.714925 9 293
+294 -1.60903 0.726121 -1.74158 11 294
+295 1.81182 -0.453377 1.8307 5 295
+296 -1.55725 -2.57155 -1.53433 13 296
+297 -1.83347 -1.20073 2.55303 4 297
+298 1.13469 -1.82849 1.68666 13 298
+299 -1.79214 2.50751 1.79493 8 299
+300 0.977904 -1.62684 -1.41699 23 300
+301 -2.04754 1.75108 1.41497 29 301
+302 1.59497 -0.311433 -1.42494 3 302
+303 -1.8076 -2.01917 1.98903 15 303
+304 0.90514 -1.34767 1.01472 4 304
+305 -1.65729 1.85865 -0.343768 3 305
+306 -0.984775 1.70145 1.66046 19 306
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+308 -1.77113 -1.56512 1.03807 27 308
+309 -1.44554 0.559198 -1.10864 5 309
+310 -1.68181 1.67015 -2.85657 8 310
+311 -1.04439 -1.703 1.79086 28 311
+312 1.48297 1.96525 1.94104 21 312
+313 1.72676 -2.19959 -1.05138 8 313
+314 1.19455 1.33787 3.00558 4 314
+315 1.40509 0.534067 -1.87471 11 315
+316 -1.46741 -1.52008 -2.35428 23 316
+317 -0.664467 1.6586 -1.47896 11 317
+318 -0.513863 1.45757 1.90468 4 318
+319 2.40767 1.32685 2.08034 4 319
+320 3.09924 0.968579 -1.47155 1 320
+321 1.486 1.21676 -1.21264 28 321
+322 1.98096 -1.38973 -0.300818 3 322
+323 1.33062 -0.833519 1.74391 17 323
+324 -1.50571 -1.01331 -2.97495 1 324
+325 -2.09029 2.7036 -1.60496 1 325
+326 -2.09011 1.78048 -1.9743 19 326
+327 1.54943 -2.36214 1.0779 6 327
+328 0.766071 -1.57983 1.86251 10 328
+329 -1.09624 -1.46139 0.103988 4 329
+330 2.58376 -1.35229 -1.78481 5 330
+331 1.83849 0.317985 -1.49598 4 331
+332 0.998608 2.07373 0.797021 4 332
+333 1.24299 1.40287 0.0256702 2 333
+334 -1.28743 1.77443 3.00009 2 334
+335 1.36508 -1.79363 -0.226316 3 335
+336 -2.36199 1.14983 -1.86629 11 336
+337 -1.32711 -1.56491 -0.691893 11 337
+338 -1.56603 0.963032 -2.24602 10 338
+339 -1.45105 -1.69373 -1.34101 44 339
+340 1.23061 1.52012 1.38893 21 340
+341 1.07092 -2.10623 -1.42341 10 341
+342 -1.86003 -2.67753 1.43975 7 342
+343 -0.862712 -0.847562 1.67546 2 343
+344 1.62123 -1.56275 -2.94765 14 344
+345 -0.00285021 -1.21727 -1.63241 4 345
+346 -1.93665 -2.81138 -1.6835 3 346
+347 2.09469 -1.91202 -1.83194 9 347
+348 2.0064 -1.64781 1.41454 23 348
+349 1.45243 -1.80333 -1.02823 19 349
+350 1.4425 0.8857 -1.5823 18 350
+351 -1.45432 2.96206 1.42257 8 351
+352 -0.86084 -1.62501 -1.05561 10 352
+353 1.31943 -1.37704 -2.07945 22 353
+354 -1.4112 -1.81981 2.82385 7 354
+355 2.10138 1.51854 -2.26957 10 355
+356 -1.82541 2.05539 1.83476 19 356
+357 -0.710386 -1.30623 1.88268 4 357
+358 1.59358 1.5666 -2.86503 9 358
+359 -1.08745 -2.16026 -1.72188 12 359
+360 2.44731 -2.01061 1.2542 4 360
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diff --git a/regtest/dimred/rt-smap-osample/projections.reference b/regtest/dimred/rt-smap-osample/projections.reference
new file mode 100644
index 0000000000000000000000000000000000000000..1876554fe72a730d27e095c4f7648ff9fbea4a36
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