matlab计算结果如何得到分数 MATLAB的命令窗口输出结果怎么把分数形式变成小数形式？
matlab\u5982\u4f55\u628a\u5c0f\u6570\u8f6c\u6362\u6210\u5206\u6570#include<iostream>
#include<string>
#include<math.h>
using namespace std;
//\u6c42\u6700\u5927\u516c\u7ea6\u6570\u51fd\u6570
__int64 gcd(__int64 a,__int64 b)
{
__int64 m;
for(m=a%b;m!=0;m=a%b)
{
a=b;
b=m;
}
return b;
}
int main()
{
string input;
while(cin>>input)
{
int indexDot=input.find('.')+1;//\u5c0f\u6570\u70b9\u7684\u4f4d\u7f6e
int indexXH=input.find('(');//\u5faa\u73af\u4f4d\u7684\u4f4d\u7f6e
bool flag=false;
if(indexXH!=string::npos)
{
flag=true;//\u8bf4\u660e\u6709\u5faa\u73af\u4f4d
indexXH++;
}
//\u6709\u9650\u5c0f\u6570\u8f6c\u5206\u6570
if(!flag)
{
int lenDecimal=input.length()-indexDot;
string decimal=input.substr(indexDot,lenDecimal);
__int64 up=atoi(decimal.c_str());//\u5f97\u5230\u5206\u5b50
//cout<<lenDecimal<<''<<up<<endl;
__int64 down=pow(10,lenDecimal);
__int64 common=gcd(up,down);
printf("\u5206\u5b50\u662f\uff1a%I64d\t\u5206\u6bcd\u662f\uff1a%I64d\n",up/common,down/common);
}
//\u5faa\u73af\u5c0f\u6570\u8f6c\u5206\u6570
else
{
int n=indexXH-indexDot-1;//\u975e\u5faa\u73af\u4f4d\u7684\u957f\u5ea6
int m=input.length()-indexXH-1;//\u5faa\u73af\u4f4d\u7684\u957f\u5ea6
string strN=input.substr(indexDot,n);
string strM=input.substr(indexXH,m);
int num1=atoi(strN.c_str());
int num2=atoi(strM.c_str());
//cout<<num1<<''<<num2<<''<<m<<''<<n<<endl;
__int64 up=num1*(pow(10,m)-1)+num2;
__int64 down=(pow(10,m)-1)*pow(10,n);
//printf("%I64d\t%I64d",up,down);
__int64 common=gcd(up,down);
printf("\u5206\u5b50\u662f\uff1a%I64d\t\u5206\u6bcd\u662f\uff1a%I64d\n",up/common,down/common);
}
}
return 0;
}
\u6269\u5c55\u8d44\u6599\uff1areturn\u8868\u793a\u628a\u7a0b\u5e8f\u6d41\u7a0b\u4ece\u88ab\u8c03\u51fd\u6570\u8f6c\u5411\u4e3b\u8c03\u51fd\u6570\u5e76\u628a\u8868\u8fbe\u5f0f\u7684\u503c\u5e26\u56de\u4e3b\u8c03\u51fd\u6570\uff0c\u5b9e\u73b0\u51fd\u6570\u503c\u7684\u8fd4\u56de\uff0c\u8fd4\u56de\u65f6\u53ef\u9644\u5e26\u4e00\u4e2a\u8fd4\u56de\u503c\uff0c\u7531return\u540e\u9762\u7684\u53c2\u6570\u6307\u5b9a\u3002
return\u901a\u5e38\u662f\u5fc5\u8981\u7684\uff0c\u56e0\u4e3a\u51fd\u6570\u8c03\u7528\u7684\u65f6\u5019\u8ba1\u7b97\u7ed3\u679c\u901a\u5e38\u662f\u901a\u8fc7\u8fd4\u56de\u503c\u5e26\u51fa\u7684\u3002\u5982\u679c\u51fd\u6570\u6267\u884c\u4e0d\u9700\u8981\u8fd4\u56de\u8ba1\u7b97\u7ed3\u679c\uff0c\u4e5f\u7ecf\u5e38\u9700\u8981\u8fd4\u56de\u4e00\u4e2a\u72b6\u6001\u7801\u6765\u8868\u793a\u51fd\u6570\u6267\u884c\u7684\u987a\u5229\u4e0e\u5426\uff08-1\u548c0\u5c31\u662f\u6700\u5e38\u7528\u7684\u72b6\u6001\u7801\uff09\uff0c\u4e3b\u8c03\u51fd\u6570\u53ef\u4ee5\u901a\u8fc7\u8fd4\u56de\u503c\u5224\u65ad\u88ab\u8c03\u51fd\u6570\u7684\u6267\u884c\u60c5\u51b5\u3002
\u6709\u4e24\u79cd\u53ef\u80fd\uff1a
1\u3001matlab\u663e\u793a\u683c\u5f0f\u88ab\u8bbe\u4e3a\u4e86\u5206\u6570\uff0c\u53ef\u4ee5\u7528format long\u8f6c\u6362\u4e3a\u5c0f\u6570\u663e\u793a\u30022\u3001\u4f7f\u7528\u4e86\u7b26\u53f7\u8ba1\u7b97\uff0c\u5f97\u5230\u7684\u7cbe\u786e\u89e3\uff0c\u4f1a\u51fa\u73b0\u5206\u6570\uff0c\u53ef\u4ee5\u7528vpa\u8f6c\u6362\u4e3a\u5c0f\u6570\u663e\u793a\u3002
\u5982\uff1a
x=sym(1/2)
y=vpa(x)
\u6269\u5c55\u8d44\u6599\uff1aMATLAB\u547d\u4ee4\u884c\u7a97\u53e3\u5e38\u89c1\u547d\u4ee4\u4e0e\u529f\u80fd
who\uff1a\u663e\u793a\u5f53\u524d\u5de5\u4f5c\u7a7a\u95f4\u4e2d\u6240\u6709\u53d8\u91cf\u7684\u4e00\u4e2a\u7b80\u5355\u5217\u8868
whos\uff1a\u5217\u51fa\u53d8\u91cf\u7684\u5927\u5b66\uff0c\u6570\u636e\u683c\u5f0f\u7b49\u8be6\u7ec6\u4fe1\u606f
what\uff1a\u5217\u51fa\u5f53\u524d\u76ee\u5f55\u4e0b\u7684.m\u6587\u4ef6\u548c.mat\u6587\u4ef6
load name\uff1a\u4e0b\u8f7dname\u6587\u4ef6\u4e2d\u7684\u6240\u6709\u53d8\u91cf\u5230\u5de5\u4f5c\u7a7a\u95f4
load name x y\uff1a\u4e0b\u8f7dname\u6587\u4ef6\u4e2d\u7684\u53d8\u91cfx,y\u5230\u5de5\u4f5c\u7a7a\u95f4
save name\uff1a\u4fdd\u5b58\u5de5\u4f5c\u7a7a\u95f4\u53d8\u91cf\u5230\u6587\u4ef6name.mat\u4e2d
save name x y\uff1a\u4fdd\u5b58\u5de5\u4f5c\u7a7a\u95f4\u53d8\u91cfx,y\u5230\u6587\u4ef6name.mat\u4e2d
\u6ce8\u610f\uff1a`
delete <\u6587\u4ef6\u540d>
\u4ece\u78c1\u76d8\u4e2d\u5220\u9664\u6307\u5b9a\u7684\u6587\u4ef6
\u8fd9\u662f\u63d2\u5165delete\u7684\u54ea\u4e00\u884c\u4ee3\u7801\uff0c<\u8981\u7528<\u8868\u793a\u3002
\u547d\u4ee4
\u529f\u80fd
clc
\u64e6\u53bb\u4e00\u9875\u547d\u4ee4\u7a97\u53e3\uff0c\u5149\u6807\u56de\u5230\u5c4f\u5e55\u7684\u5de6\u4e0a\u89d2
.....
sym(0.333333)
ans =
3002396749180579/9007199254740992
望采纳！！
ls正解
要精确的1/3直接这样就行
>> sym(1/3)
ans =
1/3
绛旓細绗﹀彿鍖栧氨鍙互浜嗭細sym(0.333333)ans = 3002396749180579/9007199254740992 鏈涢噰绾筹紒锛
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绛旓細>> a=1/3 a = 0.3333 >> format rat%%format鍙互璋冩暣鏄剧ず绮惧害锛屽叿浣撶湅doc format閲岄潰鏈夎缁嗙殑浠嬬粛 >> b=1/3 b = 1/3
绛旓細鏈変袱绉嶅彲鑳斤細1銆matlab鏄剧ず鏍煎紡琚涓轰簡鍒嗘暟锛屽彲浠ョ敤format long杞崲涓哄皬鏁版樉绀恒2銆佷娇鐢ㄤ簡绗﹀彿璁＄畻锛寰楀埌鐨勭簿纭В锛屼細鍑虹幇鍒嗘暟锛屽彲浠ョ敤vpa杞崲涓哄皬鏁版樉绀恒傚锛歺=sym(1/2)y=vpa(x)
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绛旓細鍙互鐢╲pa锛堬級鍑芥暟鏉ユ眰瑙ｅ叾鏁板艰В銆傚嵆 H=vpa(H)
