vector gives 0 integral

조회 수: 10 (최근 30일)
Gavin Seddon
Gavin Seddon 2021년 7월 28일
댓글: Star Strider 2021년 11월 3일
Hello
I have plotted a vector which has 3 planes.. When I integrate the integral is 0. There are negative regions, yet I expect a number. I us
sd = trapz((z),0,20)
sd =
0
will someone tell me if there is an error with my use of trapz?
sr

채택된 답변

Star Strider
Star Strider 2021년 7월 28일
There quite definitely is!
In your call to it:
sd = trapz((z),0,20)
the function interprets ‘z’ (the parentheses aren’t necessary) as the indepdent variable ‘x’, 0 as the dependent variable ‘y’, and 20 as the dimension. Integrating 0 produces 0 as the result.
See the documentation on trapz.
.
  댓글 수: 30
Gavin Seddon
Gavin Seddon 2021년 11월 3일
Thx
the result is
con = eval(vecInt)
con =
344*sin((500436125687261696*sin((16940918583*cos((16940918583*cos((16940918583*cos((153639*cos((144125604197931365568*cos((1484049123*cos((16940918583*cos((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/200000000 - 1689/2000)*sin((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8)*sin((16940918583*cos((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/59604644775390625 + (3267773954505189164*sin((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8)*cos((8766794979*cos((16940918583*cos((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/2500000000 + 441/250)*sin((16940918583*cos((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/48506384094556175 + (5685004955689819712*sin((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8)*sin((16940918583*cos((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8)*cos((7458176583*cos((16940918583*cos((16940918583*cos((16940918583*cos((3573*x)/10000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/10000000000 + 13/8))/1000000000 + 1153/500))/2384185791015625 - 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1689/20... Output truncated. Text exceeds maximum line length for Command Window display.
>> fprintf('%23.15E',con)
Error using fprintf
Conversion to double from sym is not possible.
>>
Star Strider
Star Strider 2021년 11월 3일
That expression is a function of ‘x’, so provide a value for it (scalar, vector, using subs if necessary), evaluate it, then print the double result as a funciton of the values of ‘x’.
.

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추가 답변 (3개)

Gavin Seddon
Gavin Seddon 2021년 7월 29일
Hello
Yes John is correct, I tried with no parenth and I see the fun integral not its value which is wht I need.
  댓글 수: 4
Gavin Seddon
Gavin Seddon 2021년 7월 29일
Hello
It is a cubic fun of an object moving in 3D space and from your description trapezoidal integration does a better job in 3D than int.
Star Strider
Star Strider 2021년 7월 29일
Thank you!
Just curious as to what you are integrating.
.

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Gavin Seddon
Gavin Seddon 2021년 7월 29일
Hello
When I searched 'vector integration' the trapezoid method came-up
yet is this correct?

Gavin Seddon
Gavin Seddon 2021년 8월 4일
Hello
I am integrating the number of molecular motions in 10e-15s.
  댓글 수: 1
Star Strider
Star Strider 2021년 8월 4일
Interesting!
.

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