c語言有限元
❶ 鍏冭＄畻鐨凢ELAC騫惰岀増鍜屼覆琛岀増鏈変粈涔堝尯鍒
銆銆鍏冭＄畻鐨凢ELAC騫惰岀増鍜屼覆琛岀増鐨勫尯鍒鍏蜂綋濡備笅錛
FELAC騫惰岀増杞浠訛紝涓昏佽捐℃濇兂閲囩敤鍏冧歡鍖栫▼搴忚捐℃柟娉曞拰鏈夐檺鍏冭璦錛屾牴鎹鏈夐檺鍏冩柟娉曠粺涓鐨勬暟瀛﹀師鐞嗗強鍏跺唴鍦ㄨ勫緥錛屼互綾諱技浜庢暟瀛﹀叕寮忔帹鐞嗙殑鏂瑰紡錛岀敱鏈夐檺鍏冮棶棰樼殑寰鍒嗘柟紼嬭〃杈懼紡鍙婂叾奼傝В綆楁硶鑷鍔ㄤ駭鐢熸湁闄愬厓紼嬪簭銆傛ょ郴緇熼傜敤浜庡悇縐嶉嗗煙鐨勫悇縐嶅伐紼嬩笌縐戝﹁＄畻闂棰橈紝紿佺牬浜嗙洰鍓嶉氱敤鏈夐檺鍏冪▼搴忓彧鐢ㄤ簬鐗瑰畾棰嗗煙鍜岀壒瀹氶棶棰樼殑闄愬埗銆傜敤鎴峰彧闇瑕佽緭鍏ユ湁闄愬厓鏂規硶鎵闇瑕佺殑鍚勭嶈〃杈懼紡鍜屽叕寮忥紝鍗沖彲鑷鍔ㄤ駭鐢熸墍闇瑕佺殑鍏ㄩ儴鏈夐檺鍏冪▼搴忥紝鍏朵腑鏈夐檺鍏冭＄畻紼嬪簭涓篊璇璦緙栧啓鐨勬湁闄愬厓璁＄畻紼嬪簭銆傜敤鎴峰湪瀹夎呬簡璇ョ郴緇熺殑璁＄畻鏈轟笂錛屽彲浠ヤ笉闇瑕佽仈緗戱紝鍗沖彲鐩存帴鐢熸垚璁＄畻紼嬪簭錛岃ョ郴緇熶笉浠呰兘澶熺敓鎴愪覆琛屾湁闄愬厓璁＄畻紼嬪簭錛屼篃鍙浠ョ敓鎴愬苟琛屾湁闄愬厓璁＄畻紼嬪簭錛屽苟琛岀増娌℃湁鐢佃剳鍙版暟宸ヤ綔鐨勯檺鍒訛紝澶у氭暟浼氶夋嫨騫惰岀増銆
FELAC涓茶岀増杞浠訛紝璁捐℃濇兂閲囩敤鍏冧歡鍖栫殑紼嬪簭璁捐℃柟娉曞拰鏈夐檺鍏冭璦錛屾牴鎹鏈夐檺鍏冩柟娉曠粺涓鐨勬暟瀛﹀師鐞嗗強鍏跺唴鍦ㄨ勫緥錛屼互綾諱技浜庢暟瀛﹀叕寮忔帹鐞嗙殑鏂瑰紡錛岀敱鏈夐檺鍏冮棶棰樼殑鍋忓井鍒嗘柟紼嬭〃杈懼紡鍙婂叾奼傝В綆楁硶鑷鍔ㄤ駭鐢熸湁闄愬厓紼嬪簭銆傛ょ郴緇熼傜敤浜庡悇縐嶉嗗煙鐨勫悇縐嶅伐紼嬩笌縐戝﹁＄畻闂棰橈紝紿佺牬浜嗙洰鍓嶉氱敤鏈夐檺鍏冪▼搴忓彧鐢ㄤ簬鐗瑰畾棰嗗煙鍜岀壒瀹氶棶棰樼殑闄愬埗銆傜敤鎴峰彧闇瑕佽緭鍏ユ湁闄愬厓鏂規硶鎵闇瑕佺殑鍚勭嶈〃杈懼紡鍜屽叕寮忥紝鍗沖彲鑷鍔ㄤ駭鐢熸墍闇瑕佺殑鍏ㄩ儴鏈夐檺鍏冪▼搴忥紝鍏朵腑鏈夐檺鍏冭＄畻紼嬪簭涓篊璇璦緙栧啓鐨勬湁闄愬厓璁＄畻紼嬪簭銆傜敤鎴峰湪瀹夎呬簡璇ョ郴緇熺殑璁＄畻鏈轟笂錛屽彲浠ヤ笉闇瑕佽仈緗戱紝鍗沖彲鐩存帴鐢熸垚璁＄畻紼嬪簭錛岃ョ郴緇熷彧鑳界敓鎴愪覆琛岀殑鏈夐檺鍏冨強鏈夐檺浣撶Н娉曡＄畻紼嬪簭錛屼覆琛岀増鏄鍙鑳藉湪涓鍙扮數鑴戣繘琛屽伐浣溿
❷ 鍩轟簬c璇璦鐨勪竴緇存湁闄愬厓杞浠剁殑璁捐
boolInitFft(FFT_HANDLE*hfft,intcount,intwindow)
46{
47inti;
48
49hfft->count=count;
50hfft->win=newfloat[count];
51if(hfft->win==NULL)
52{
53returnfalse;
54}
55hfft->wt=newCOMPLEX[count];
56if(hfft->wt==NULL)
57{
58delete[]hfft->win;
59returnfalse;
60}
61for(i=0;i<count;i++)
62{
63hfft->win[i]=float(0.50-0.50*cos(2*M_PI*i/(count-1)));
64}
65for(i=0;i<count;i++)
66{
67floatangle=-i*M_PI*2/count;
68hfft->wt[i].re=cos(angle);
69hfft->wt[i].im=sin(angle);
70}
71
72returntrue;
73}
74
75voidFFT(FFT_HANDLE*hfft,COMPLEX*TD2FD)
76{
77inti,j,k,butterfly,p;
78
79intpower=NumberOfBits(hfft->count);
80
81/*銛跺艦榪愮畻*/
82for(k=0;k<power;k++)
83{
84for(j=0;j<1<<k;j++)
85{
86butterfly=1<<(power-k);
87for(i=0;i<butterfly/2;i++)
88{
89p=j*butterfly;
90COMPLEXt=TD2FD[i+p]+TD2FD[i+p+butterfly/2];
91TD2FD[i+p+butterfly/2]=(TD2FD[i+p]-TD2FD[i+p+butterfly/2])*hfft->wt[i*(1<<k)];
92TD2FD[i+p]=t;
93}
94}
95}
96
97/*閲嶆柊鎺掑簭*/
98for(i=1,j=hfft->count/2;i<=hfft->count-2;i++)
99{
100if(i<j)
101{
102COMPLEXt=TD2FD[j];
103TD2FD[j]=TD2FD[i];
104TD2FD[i]=t;
105}
106k=hfft->count/2;
107while(k<=j)
108{
109j=j-k;
110k=k/2;
111}
112j=j+k;
113}
114}
❸ 鐢╟璇璦寮鍙戞湁闄愬厓杞浠訛紝鏈鍚庢庝箞鐢熸垚鍥
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鍏跺疄浣犲彲浠ュ啀瀛Java鎴栬匔#銆
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C#鍒欐槸褰撳墠鍋氬浘褰㈠寲紼嬪簭鏈綆鍗曢珮鏁堢殑浜嗭紝涓嶉渶瑕佺紪紼嬪崟闈犻紶鏍囨嫋鎷藉氨鑳藉仛鍑哄浘褰㈢晫闈銆傜壒鍒鏄疌#鐨刉PF鍥懼艦妗嗘灦鏇存槸鎶婂浘褰㈠寲緙栫▼綆鍖栧埌浜嗘瀬闄愩
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C#璇璦緇煎悎Java鍜孋++鐨勪紭鐐廣侸ava鍜孋++閮芥簮鑷狢璇璦銆傛墍浠ュC#涔嬪墠鏈濂藉厛瀛︿竴涓婥++錛孋銆丆++銆丆#鍙浠ヨ存槸涓鑴夌浉鎵匡紝鍚戜笅鍏煎圭殑銆
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C錛堢粨鏋勫寲璇璦錛屽叆闂錛-> C++錛堥潰鍚戝硅薄璇璦錛岄摵鍨錛 -> C# 錛堜韓鍙楀揩閫熷浘褰㈠寲寮鍙戝惂錛
杞杞斤紝浠呬緵鍙傝冦