[英]How do I use functions defined with Func in the solve function?
Say I have this function defined using Func
:假设我使用
Func
定义了这个函数:
Define f(x)=Func
Return x²
EndFunc
I can use this function in most cases perfectly fine:在大多数情况下,我可以完美地使用此功能:
f(2) © 4
f(3)+f(4) © 24
cos(f(sqrt(π))) © -1
expand(f(x+1)) © x²+2⋅x+1
However, when I try to use this function in solve
or cSolve
(possibly some other functions as well), it doesn't work as expected:但是,当我尝试在
solve
或cSolve
(也可能是其他一些函数)中使用此函数时,它无法按预期工作:
© I expected 'x=-2 or x=2'
solve(f(x)=4,x) © f(x)=4
© I expected 'x=-2⋅i or x=2⋅i'
cSolve(f(x)=-4,x) © f(x)=-4
It doesn't seem to expand/evaluate the function call and leaves it as f(x)
.它似乎没有扩展/评估函数调用并将其保留为
f(x)
。
On the other hand, if I don't use Func
, it works perfectly fine:另一方面,如果我不使用
Func
,它工作得很好:
Define g(x)=x² © Done
solve(g(x)=4,x) © x=-2 or x=2
cSolve(g(x)=4,x) © x=-2⋅i or x=2⋅i
nSolve
works for both f
and g
as intended, so this makes me think it's something to do with symbolic computations. nSolve
按预期对f
和g
都有效,所以这让我认为这与符号计算有关。
Func
(so I can use local variables and things like that) that still work with functions like solve
and cSolve
?Func
定义函数的方法(这样我就可以使用局部变量和类似的东西)仍然可以使用solve
和cSolve
类的函数? I'm using a TI-Nspire CX CAS Handheld (the older one, not the CX II).我使用的是 TI-Nspire CX CAS 手持设备(旧的,不是 CX II)。
I contacted customer support and they responded with我联系了客户支持,他们回复了
There is not a way to use the function defined the way you did using "func" and "return" with the solve command.
没有办法像使用“func”和“return”和solve命令那样使用定义的函数。
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