matlab解方程 x*e^(-n*t)-x*e^(-m*t)-y*e^(-m*t)+y*e^(-z*t)-c=0syms x1 x2 x3 x4 x5 x6 x7;>> t=[0.25,0.5,0.75,1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12,13,14,15,16];>> c=[30,68,75,82,82,77,68,68,58,51,50,41,38,35,28,25,18,15,12,10,7,7,4];>> [x,y,z,m,
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 17:51:35
![matlab解方程 x*e^(-n*t)-x*e^(-m*t)-y*e^(-m*t)+y*e^(-z*t)-c=0syms x1 x2 x3 x4 x5 x6 x7;>> t=[0.25,0.5,0.75,1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12,13,14,15,16];>> c=[30,68,75,82,82,77,68,68,58,51,50,41,38,35,28,25,18,15,12,10,7,7,4];>> [x,y,z,m,](/uploads/image/z/5906555-35-5.jpg?t=matlab%E8%A7%A3%E6%96%B9%E7%A8%8B+x%2Ae%5E%28-n%2At%29-x%2Ae%5E%28-m%2At%29-y%2Ae%5E%28-m%2At%29%2By%2Ae%5E%28-z%2At%29-c%3D0syms+x1+x2+x3+x4+x5+x6+x7%3B%3E%3E+t%3D%5B0.25%2C0.5%2C0.75%2C1%2C1.5%2C2%2C2.5%2C3%2C3.5%2C4%2C4.5%2C5%2C6%2C7%2C8%2C9%2C10%2C11%2C12%2C13%2C14%2C15%2C16%5D%3B%3E%3E+c%3D%5B30%2C68%2C75%2C82%2C82%2C77%2C68%2C68%2C58%2C51%2C50%2C41%2C38%2C35%2C28%2C25%2C18%2C15%2C12%2C10%2C7%2C7%2C4%5D%3B%3E%3E+%5Bx%2Cy%2Cz%2Cm%2C)
matlab解方程 x*e^(-n*t)-x*e^(-m*t)-y*e^(-m*t)+y*e^(-z*t)-c=0syms x1 x2 x3 x4 x5 x6 x7;>> t=[0.25,0.5,0.75,1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12,13,14,15,16];>> c=[30,68,75,82,82,77,68,68,58,51,50,41,38,35,28,25,18,15,12,10,7,7,4];>> [x,y,z,m,
matlab解方程 x*e^(-n*t)-x*e^(-m*t)-y*e^(-m*t)+y*e^(-z*t)-c=0
syms x1 x2 x3 x4 x5 x6 x7;
>> t=[0.25,0.5,0.75,1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12,13,14,15,16];
>> c=[30,68,75,82,82,77,68,68,58,51,50,41,38,35,28,25,18,15,12,10,7,7,4];
>> [x,y,z,m,n]=solve(x*e^(-n*t)-x*e^(-m*t)-y*e^(-m*t)+y*e^(-z*t)-c)
无法解出结果,
matlab解方程 x*e^(-n*t)-x*e^(-m*t)-y*e^(-m*t)+y*e^(-z*t)-c=0syms x1 x2 x3 x4 x5 x6 x7;>> t=[0.25,0.5,0.75,1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12,13,14,15,16];>> c=[30,68,75,82,82,77,68,68,58,51,50,41,38,35,28,25,18,15,12,10,7,7,4];>> [x,y,z,m,
你的e是自然常数2.71828…吗?那么matlab里应e^x的表达式应该是
exp(x)
而不是你写的那样.
另外,solve函数不是万能的,很多多元方程它是解不出来的,你需要用数值方法求解.