hello every one,
Ive been messing with the cufft
I have an array of 256 numbers, which I load onto the device in an array of cufftReal d_rF.
then I also have an array of the same length but cufftComplex d_F.
[codebox]
.
.
.
float* h_Rdata = (float*)malloc(sizeof(float) * NX);
Complex* h_data = (Complex*)malloc(sizeof(Complex) * NX);
.
.
.
cutilSafeCall(cudaMemcpy(h_Rdata, d_rF, sizeof(float) * NX, cudaMemcpyDeviceToHost));
for(int x=0;x<256;x++)
{
cout<<x<<" "<<h_Rdata[x]<<endl;
}
// Create a 1D FFT plan.
cufftPlan1d(&plan, NX, CUFFT_R2C, 1);
// Use the CUFFT plan to transform the signal in place.
cufftExecR2C(plan, d_rF, d_F);
cutilSafeCall(cudaMemcpy(h_data, d_F, sizeof(Complex) * NX, cudaMemcpyDeviceToHost));
for(int x=0;x<256;x++)
{
cout<<x<<" "<<h_data[x].x<<" "<<h_data[x].y<<endl;
}
[/codebox]
This is the wierd output:
0 1.62309
1 1.59654
2 1.78235
3 1.52576
4 1.5877
5 1.49921
6 1.46382
7 1.36648
8 1.5346
9 1.50806
10 1.50806
11 1.2957
12 1.45497
13 1.57884
14 1.47266
15 1.44612
16 1.47266
17 1.37534
18 1.25146
19 1.43727
20 1.04795
21 1.22491
22 1.26916
23 1.18952
24 1.32225
25 1.28685
26 0.906373
27 1.23376
28 1.23376
29 1.18952
30 1.10104
31 1.0391
32 1.04795
33 0.941772
34 1.0214
35 0.844436
36 1.00371
37 0.82674
38 0.72056
39 0.809045
40 0.79135
41 0.702865
42 0.525904
43 0.72056
44 0.817897
45 0.649779
46 0.596685
47 0.525904
48 0.658623
49 0.649779
50 0.481662
51 0.676318
52 0.543599
53 0.47281
54 0.552443
55 0.410872
56 0.463967
57 0.463967
58 0.348935
59 0.348935
60 0.419724
61 0.145427
62 0.233911
63 0.446263
64 0.402029
65 0.384325
66 0.216216
67 0.534748
68 0.384325
69 0.171974
70 0.180817
71 0.348935
72 0.189669
73 0.295849
74 0.233911
75 0.145427
76 0.0657939
77 0.145427
78 -0.0315426
79 0.198513
80 0.163122
81 0.145427
82 0.030395
83 0.030395
84 -0.252746
85 -0.0757849
86 0.0834892
87 0.0215516
88 0.251607
89 -0.040386
90 0.15427
91 -0.146566
92 -0.128871
93 -0.0492379
94 0.00385633
95 -0.120019
96 -0.288136
97 -0.128871
98 -0.120019
99 -0.279293
100 -0.146566
101 -0.146566
102 -0.146566
103 -0.0138389
104 -0.429715
105 -0.296988
106 -0.491653
107 -0.137723
108 -0.44741
109 -0.341231
110 -0.394316
111 -0.376621
112 -0.164261
113 -0.341231
114 -0.226199
115 -0.217355
116 -0.181956
117 -0.270441
118 -0.341231
119 -0.544739
120 -0.332379
121 -0.367778
122 -0.367778
123 -0.606676
124 -0.394316
125 -0.527043
126 -0.473949
127 -0.438559
128 -0.535887
129 -0.429715
130 -0.571286
131 -0.668614
132 -0.55359
133 -0.704004
134 -0.668614
135 -0.704004
136 -0.757098
137 -0.907521
138 -0.677466
139 -0.942911
140 -0.951763
141 -1.06679
142 -0.730551
143 -0.898669
144 -0.801341
145 -0.907521
146 -0.704004
147 -0.951763
148 -1.18182
149 -0.951763
150 -0.925216
151 -1.06679
152 -0.695161
153 -0.942911
154 -1.00485
155 -0.898669
156 -1.12872
157 -0.934059
158 -1.04909
159 -0.872122
160 -1.11987
161 -1.11987
162 -0.898669
163 -1.04909
164 -1.37647
165 -1.24376
166 -1.10218
167 -1.2526
168 -0.995997
169 -1.11987
170 -1.11987
171 -1.19951
172 -1.31454
173 -1.18182
174 -1.34993
175 -1.41186
176 -1.27915
177 -1.31454
178 -1.36763
179 -1.38533
180 -1.14642
181 -1.41186
182 -1.48265
183 -1.2349
184 -1.29684
185 -1.41186
186 -1.47381
187 -1.37647
188 -1.49151
189 -1.33223
190 -1.46496
191 -1.34108
192 -1.45611
193 -1.39417
194 -1.55344
195 -1.15527
196 -1.24376
197 -1.26145
198 -1.32339
199 -1.35878
200 -1.27915
201 -1.19951
202 -1.09333
203 -1.12872
204 -1.12872
205 -0.783646
206 -1.06679
207 -1.15527
208 -0.880974
209 -0.995997
210 -0.889817
211 -0.951763
212 -0.942911
213 -0.748247
214 -0.597824
215 -0.748247
216 -0.491653
217 -0.438559
218 -0.491653
219 -0.473949
220 -0.385473
221 -0.0226908
222 -0.0669331
223 -0.111175
224 -0.0669331
225 0.216216
226 -0.208504
227 0.180817
228 0.242755
229 0.180817
230 0.136575
231 0.22506
232 0.552443
233 0.570147
234 0.623232
235 0.658623
236 0.658623
237 0.835592
238 1.39303
239 1.37534
240 1.41073
241 1.38419
242 1.66733
243 1.63194
244 2.12744
245 1.62309
246 1.94163
247 2.04781
248 2.27786
249 2.09205
250 2.10974
251 1.96817
252 2.22477
253 2.12744
254 2.12744
255 2.3044
0 0.013223 0
1 125.589 -97.4914
2 73.5993 2.05362
3 27.3758 14.4973
4 9.83228 12.6541
5 4.14769 6.37364
6 4.24651 11.6731
7 0.0536612 7.13867
8 1.26574 8.52379
9 -1.65793 4.35206
10 -1.63675 5.52411
11 -2.1299 2.90129
12 -3.42531 -0.483899
13 -2.56707 1.19902
14 0.613707 0.74622
15 2.0512 2.65198
16 1.28713 0.761634
17 -0.0389231 2.32018
18 1.90128 0.542881
19 -1.1291 2.20142
20 2.30096 -0.85234
21 -0.353202 0.25511
22 -1.20106 2.26068
23 0.7145 -1.16371
24 -0.593511 -0.199678
25 0.0715992 0.746205
26 -0.758886 0.812164
27 -0.30864 0.616363
28 -1.16105 1.16024
29 0.545582 -2.17984
30 1.54297 1.04905
31 -0.525643 1.7628
32 2.63921 0.322476
33 -1.01197 1.25928
34 -0.148713 1.0354
35 2.57134 2.2437
36 -0.879272 -1.65674
37 -1.90698 0.769346
38 0.772566 -0.0143051
39 -1.141 0.306798
40 -1.5687 2.21978
41 -0.964771 -0.656651
42 -0.391873 -0.401092
43 0.108266 -0.33612
44 1.589 1.83535
45 -0.066745 0.76091
46 0.622943 0.612212
47 -0.448492 2.13539
48 -2.92175 1.59187
49 -2.8068 0.466165
50 -1.96576 1.58289
51 -2.56866 0.416314
52 -0.403031 1.77096
53 -0.270214 -1.23578
54 -0.73457 -1.5027
55 1.00639 -0.320103
56 -0.275896 -0.121656
57 1.98626 0.74013
58 0.150748 -2.23046
59 -0.242996 0.440404
60 2.16056 -0.806757
61 -0.221635 2.14119
62 -1.95433 0.571309
63 0.486124 0.365236
64 1.0441 -0.106205
65 2.76061 -1.07172
66 -0.706307 -0.459384
67 -2.15571 0.93468
68 -0.0629404 3.06563
69 -2.59316 0.233405
70 -1.35508 -1.16166
71 0.281918 0.100832
72 0.387475 1.14622
73 -1.52258 -0.399315
74 1.72536 0.418018
75 -2.12741 3.01702
76 -0.199979 0.758471
77 -0.348014 1.11992
78 -3.70223 -0.103214
79 -0.85485 0.408197
80 0.00513601 0.327361
81 1.19659 -0.00268471
82 -0.00901607 1.52935
83 -0.709262 -0.264943
84 2.46532 -0.917811
85 0.960356 0.0340135
86 -1.48646 0.522672
87 0.0822357 -0.47101
88 -2.91026 -0.279893
89 -0.546254 2.30899
90 -0.0820942 1.12444
91 1.09606 1.9527
92 -2.9062 2.74379
93 -0.792652 2.02758
94 -1.00118 1.45457
95 -0.422203 -2.01798
96 1.11249 -0.597761
97 -1.3728 0.6111
98 -0.90328 -0.11501
99 0.146492 1.10298
100 -1.46592 -1.03234
101 -0.174138 -0.300478
102 -1.25809 2.31031
103 -0.89533 -0.576144
104 -1.87388 1.17083
105 2.50249 -0.581984
106 0.221582 -0.280879
107 0.273538 0.512227
108 0.466491 -1.73086
109 -1.75707 1.89075
110 0.0494137 0.620006
111 0.575393 0.990245
112 -2.05137 1.12522
113 -1.21459 -0.37617
114 0.0487164 -0.142939
115 -0.353316 -0.392413
116 -1.91559 0.352213
117 0.294271 1.14546
118 -3.17852 0.559147
119 0.469072 3.18798
120 -2.21722 -1.4865
121 -1.23593 -1.70163
122 2.38779 -0.255282
123 0.384482 -2.04733
124 0.966435 -0.85213
125 -0.0983543 -1.85198
126 3.11217 0.201201
127 -0.0226593 -0.469227
128 0.725556 0
129 0 0
130 0 0
131 0 0
132 0 0
133 0 0
134 0 0
135 0 0
136 0 0
137 0 0
138 0 0
139 0 0
140 0 0
141 0 0
142 0 0
143 0 0
144 0 0
145 0 0
146 0 0
147 0 0
148 0 0
149 0 0
150 0 0
151 0 0
152 0 0
153 0 0
154 0 0
155 0 0
156 0 0
157 0 0
158 0 0
159 0 0
160 0 0
161 0 0
162 0 0
163 0 0
164 0 0
165 0 0
166 0 0
167 0 0
168 0 0
169 0 0
170 0 0
171 0 0
172 0 0
173 0 0
174 0 0
175 0 0
176 0 0
177 0 0
178 0 0
179 0 0
180 0 0
181 0 0
182 0 0
183 0 0
184 0 0
185 0 0
186 0 0
187 0 0
188 0 0
189 0 0
190 0 0
191 0 0
192 0 0
193 0 0
194 0 0
195 0 0
196 0 0
197 0 0
198 0 0
199 0 0
200 0 0
201 0 0
202 0 0
203 0 0
204 0 0
205 0 0
206 0 0
207 0 0
208 0 0
209 0 0
210 0 0
211 0 0
212 0 0
213 0 0
214 0 0
215 0 0
216 0 0
217 0 0
218 0 0
219 0 0
220 0 0
221 0 0
222 0 0
223 0 0
224 0 0
225 0 0
226 0 0
227 0 0
228 0 0
229 0 0
230 0 0
231 0 0
232 0 0
233 0 0
234 0 0
235 0 0
236 0 0
237 0 0
238 0 0
239 0 0
240 0 0
241 0 0
242 0 0
243 0 0
244 0 0
245 0 0
246 0 0
247 0 0
248 0 0
249 0 0
250 0 0
251 0 0
252 0 0
253 0 0
254 0 0
255 0 0
So can anyone explain why i only get the first half of the answers?