matlab中怎么把积分函数 int 得到的不定积分式代入 solve 函数中进行计算?
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matlab中怎么把积分函数 int 得到的不定积分式代入 solve 函数中进行计算?
例如:
syms r x
fun=int(r*exp(-2*(r/2)^2),r,0,x);
x=solve('fun-0.5','x');
运行将会报错:
Warning:Explicit solution could not be found.
> In solve at 81
但是如果是运行
x=solve('int(r*exp(-2*(r/2)^2)-0.5,r,0,x)','x');
又会报错
Error using ==> solve>getEqns at 182
' int(r*exp(-2*(r/2)^2)-0.5,r,0,x) ' is not a valid expression or equation.
Error in ==> solve at 67
[eqns,vars] = getEqns(varargin{:});
例如:
syms r x
fun=int(r*exp(-2*(r/2)^2),r,0,x);
x=solve('fun-0.5','x');
运行将会报错:
Warning:Explicit solution could not be found.
> In solve at 81
但是如果是运行
x=solve('int(r*exp(-2*(r/2)^2)-0.5,r,0,x)','x');
又会报错
Error using ==> solve>getEqns at 182
' int(r*exp(-2*(r/2)^2)-0.5,r,0,x) ' is not a valid expression or equation.
Error in ==> solve at 67
[eqns,vars] = getEqns(varargin{:});
![matlab中怎么把积分函数 int 得到的不定积分式代入 solve 函数中进行计算?](/uploads/image/z/17444898-18-8.jpg?t=matlab%E4%B8%AD%E6%80%8E%E4%B9%88%E6%8A%8A%E7%A7%AF%E5%88%86%E5%87%BD%E6%95%B0+int+%E5%BE%97%E5%88%B0%E7%9A%84%E4%B8%8D%E5%AE%9A%E7%A7%AF%E5%88%86%E5%BC%8F%E4%BB%A3%E5%85%A5+solve+%E5%87%BD%E6%95%B0%E4%B8%AD%E8%BF%9B%E8%A1%8C%E8%AE%A1%E7%AE%97%3F)
syms r x
fun=int(r*exp(-2*(r/2)^2),r,0,x);
x=solve(fun-0.5)
x =
2^(1/2)*log(2)^(1/2)
-2^(1/2)*log(2)^(1/2)
fun=int(r*exp(-2*(r/2)^2),r,0,x);
x=solve(fun-0.5)
x =
2^(1/2)*log(2)^(1/2)
-2^(1/2)*log(2)^(1/2)