matlab中将π表示成弧度而不是3.1415怎么弄？还有怎么转换弧度跟角度间的关系呢？谢谢！ 弧度中的π ，是指3.1415······ 还是 180° ...
\u5728matlab\u4e2d\uff0c\u89d2\u5ea6\u7528\u4ec0\u4e48\u5b57\u6bcd\u8868\u793a\u5982\u679c\u60f3\u7528\u5b57\u6bcd\u8868\u793a\u89d2\u5ea6\uff0c\u6709\u4e24\u4e2a\u65b9\u6cd5\uff1a
1. \u7528\u4e09\u89d2\u51fd\u6570sind(\u03b84)\u3001cosd(\u03b84)\u3001tand(\u03b84)\u3001atand(\u03b84)\u8fdb\u884c\u8868\u793a\uff0c\u6ce8\u610f\uff1a\u03b84\u5728\u8f93\u5165\u65f6\u662f\u89d2\u5ea6\uff0c\u53ea\u662f\u6ca1\u6709\u5ea6\u6570\u7279\u6709\u7684\u7b26\u53f7(\u00b0)\u800c\u5df2\u3002
2. \u7528deg2rad\u5c06\u89d2\u5ea6\u8f6c\u6362\u4e3a\u5f27\u5ea6\u300245\u5ea6\u5c31\u662f45/180*pi\uff0c60\u5ea6\u5c31\u662f60/180*pi\u3002pi=3.1415\u3002
\u6269\u5c55\u8d44\u6599\uff1a
MATLAB\u4e2d\u89d2\u5ea6\u8f6c\u6362\u6210\u5f27\u5ea6\u51fd\u6570\u2014\u2014degtorad
Syntax\uff1aangleInRadians = degtorad(angleInDegrees)
\u8bed\u6cd5\uff1a\u5f27\u5ea6 = degtorad(\u89d2\u5ea6)
Description
\u63cf\u8ff0\uff1aangleInRadians = degtorad(angleInDegrees)\u5c06\u89d2\u5ea6\u5355\u4f4d\u4ece\u5ea6\u6570\u8f6c\u6362\u4e3a\u5f27\u5ea6\u3002\u8fd9\u662f\u89d2\u5ea6\u8f6c\u6362\u51fd\u6570\u548c\u8ddd\u79bb\u8f6c\u6362\u51fd\u6570\uff0c\u56e0\u4e3a\u5f27\u957f\u53ef\u4ee5\u662f\u5f27\u5ea6\u6216\u5ea6\u6570\u7684\u8ddd\u79bb\u7684\u5ea6\u91cf\uff0c\u53ea\u8981\u534a\u5f84\u662f\u5df2\u77e5\u7684\u3002ExamplesShow that there are 2\u03c0 radians in a full circle:2*pi - degtorad(360)ans =
0
\u53c2\u8003\u8d44\u6599\uff1a
\u767e\u5ea6\u767e\u79d1\u2014\u2014DEGREES\u51fd\u6570
\u5f27\u5ea6\u4e2d\u7684\u03c0 \uff0c\u662f\u63073.1415...\uff0c\u8868\u793a\u8fd9\u4e2a\u89d2\u6240\u5728\u7684\u5f27\u957f\u662f\u534a\u5f84\u7684\u03c0\u500d\uff08\u53733.1415...\u500d\uff09\u3002
\u5f27\u5ea6\u662f\u89d2\u7684\u5ea6\u91cf\u8861\u3002\u4f46\u662f\u5f27\u5ea6\u4e0e\u89d2\u5ea6\u7684\u5ea6\u91cf\u65b9\u6cd5\u662f\u4e0d\u540c\u7684\u3002\u5f27\u5ea6\u662f\u5f27\u5ea6\uff0c\u89d2\u5ea6\u662f\u89d2\u5ea6\u3002
\u5f27\u5ea6\u662f\u5f27\u957f\u4e0e\u534a\u5f84\u7684\u6bd4\u503c\uff0c\u8868\u793a\u5f27\u957f\u662f\u534a\u5f84\u7684\u591a\u5c11\u500d\uff0c\u662f\u6570\u503c\uff0c\u6ca1\u6709\u5355\u4f4d\u3002
\u89d2\u5ea6\u4e3a180\u00b0\u7684\u89d2\uff0c\u5176\u5f27\u5ea6\u5c31\u662f\u03c0\uff0c\u800c\u4e0d\u80fd\u8bf4\u5f27\u5ea6\u662f180\u00b0\u3002
\u89d2\u5ea6\u4e3a180\u00b0\u7684\u89d2\uff0c\u5f27\u957f\u662f\u03c0r(\u534a\u5468\u957f)\uff0c\u5f27\u5ea6\u5c31\u662f\u03c0r/r=\u03c0=3.1415.....
\u4e5f\u5c31\u8868\u793a\u8fd9\u4e2a\u89d2\u6240\u5728\u7684\u5f27\u957f\u662f\u534a\u5f84\u7684\u03c0\u500d\u3002
π本身就表示弧度，在MATLAB中可以直接用 pi 来表示；
弧度与角度之间的关系为 ：弧度/π = 角度/180，即 弧度 = π/180 * 角度。
绛旓細蟺鏈韩灏琛ㄧず寮у害锛屽湪MATLAB涓鍙互鐩存帴鐢 pi 鏉ヨ〃绀猴紱寮у害涓庤搴︿箣闂寸殑鍏崇郴涓 锛氬姬搴/蟺 = 瑙掑害/180锛屽嵆 寮у害 = 蟺/180 * 瑙掑害銆
绛旓細set(gca,'XTick',[0:pi:4*pi]) 璁剧疆鍒诲害鑼冨洿鍜岄棿闅 set(gca,'xtickLabel',{'0','蟺','2蟺','3蟺','4蟺'}) 璁剧疆鍒诲害鏍囩 涓句緥濡備笅锛>> x = 0:0.1*pi:4*pi;>> y = sin(x);>> plot(x,y)>> xlim([0 4*pi])>> set(gca,'XTick',[0:pi:4*pi])>> set(gca,'...
绛旓細1銆佸ご鏂囦欢math.h涓畯瀹氫箟鐨勬槸M_PI define M_PI 3.14159265358979323846 2銆佽繖鏄竴涓湪搴撴枃浠跺ご鏂囦欢math.h涓殑瀹氫箟鐨勫畯,瀹為檯涓婂氨鏄渾鍛ㄧ巼蟺鐨勪竴涓繎浼煎硷紝绾︾瓑浜3.1415 涓嬮潰鏄竴涓眰涓夎鍑芥暟sin(a)鍊肩殑涓涓▼搴忥紝杩欓噷灏辩敤鍒颁簡M_PI杩欎釜瀹忋傜敱浜庤繖閲岀殑a瑕佹眰鏄寮у害锛屾墍浠ュ浜庤緭鍏ョ殑瑙掔殑搴︽暟鍋氫簡鐩...
绛旓細寮у害=瑙掑害/180*蟺 鍦matlab鐨璁＄畻涓彲浠ヤ娇鐢 寮у害璁＄畻鐨勫嚱鏁 寮у害璁＄畻鍑芥暟閭ｄ箞璇灏瑙掑害杞寲涓哄姬搴︼紝璁＄畻鍏紡濡備笅锛歳ad = deg/180*pi;鐒跺悗鍙互鐢 sin(rad) 鎴栬卌os(rad) 绛夌瓑璁＄畻涓夎鍑芥暟鍊 瑙掑害璁＄畻鍑芥暟,濡傛灉deg鏄搴﹀奸偅涔堝彲浠ョ敤濡備笅鍑芥暟锛歴ind(deg) 锛 cosd(deg), acosd(y) 绛夌瓑 acosd 鍙互鐩...
绛旓細绋嬪簭濡備笅锛歩nclude <stdio.h> include <math.h> main(){ double x,s,p;printf("input value of x:");scanf("%lf",&x);s=cos(x);p=sin(x);printf("cos(%lf)=%lf\n",x,s);printf("sin(%lf)=%lf\n",x,p);}
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