在matalb中对于反三角函数进行符号积分>>symsx>>int(x*log(x^4)*asin(1/(x^2)),x,1,3)Warning:Explicitintegralcouldnotbefound.ans=int(x*asin(1/x^2)*log(x^4),x=1..3)

Question

在matalb中对于反三角函数进行符号积分
>> syms x
>> int(x*log(x^4)*asin(1/(x^2)),x,1,3)
Warning:Explicit integral could not be
found.
ans =
int(x*asin(1/x^2)*log(x^4),x = 1..3)

Answer 1

--- help for filtstates/int.m ---
INT Convert a FILTSTATES.CIC object to an integer matrix.
INT(Hs) returns an signed integer matrix for the FILTSTATES.CIC
object.
EXAMPLE:
Hm = mfilt.cicdecim;
hs = Hm.states; % Returns a FILTSTATES.CIC object
states = int(hs); % Convert object to a signed integer matrix.
int（***）：就是把括号里的转化成整型类型.
int(x*asin(1/x^2)*log(x^4),x = 1..3)：该函数得到结果后,把结果变成整型,如果计算得到3.5,那么输出的是3