技术问答matlab澶氱粍鏁版嵁濡備綍鎷熷悎鏇茬嚎 - 扬州沐宇科技

鍦∕atlab涓紝鍙互浣跨敤polyfit鍑芥暟鏉ユ嫙鍚堝缁勬暟鎹殑鏇茬嚎銆俻olyfit鍑芥暟鐨勮娉曞涓嬶細

p = polyfit(x, y, n)

鍏朵腑锛寈鍜寉鍒嗗埆涓哄缁勬暟鎹殑鑷彉閲忓拰鍥犲彉閲忥紝n涓鸿鎷熷悎鐨勬洸绾跨殑闃舵暟銆傚嚱鏁皃olyfit浼氳繑鍥炰竴涓郴鏁板悜閲弍锛岃鍚戦噺鍖呭惈浜嗘嫙鍚堟洸绾跨殑绯绘暟銆?/p>

鎺ョ潃锛屽彲浠ヤ娇鐢╬olyval鍑芥暟鏉ヨ绠楁嫙鍚堟洸绾跨殑鍊笺€俻olyval鍑芥暟鐨勮娉曞涓嬶細

y_fit = polyval(p, x)

鍏朵腑锛宲涓簆olyfit鍑芥暟杩斿洖鐨勭郴鏁板悜閲忥紝x涓鸿璁＄畻鎷熷悎鏇茬嚎鍊肩殑鑷彉閲忋€?/p>

鏈€鍚庯紝鍙互浣跨敤plot鍑芥暟灏嗗師濮嬫暟鎹偣鍜屾嫙鍚堟洸绾跨粯鍒跺湪鍚屼竴寮犲浘涓婏紝绀轰緥浠ｇ爜濡備笅锛?/p>

% 鐢熸垚澶氱粍鏁版嵁
x = [1, 2, 3, 4, 5];
y = [2, 3, 5, 7, 10];

% 鎷熷悎鏇茬嚎
p = polyfit(x, y, 2);
y_fit = polyval(p, x);

% 缁樺埗鍘熷鏁版嵁鐐瑰拰鎷熷悎鏇茬嚎
plot(x, y, 'o');
hold on;
plot(x, y_fit, '-');
legend('Original Data', 'Fitted Curve');

杩愯浠ヤ笂浠ｇ爜锛屽皢浼氱粯鍒跺嚭鍘熷鏁版嵁鐐瑰拰鎷熷悎鐨勪簩娆℃洸绾裤€傚彲浠ユ牴鎹疄闄呮儏鍐佃皟鏁磒olyfit鍑芥暟涓殑闃舵暟n锛屼互鑾峰緱鏇村ソ鐨勬嫙鍚堟晥鏋溿€?/p>