vector gives 0 integral

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Gavin Seddon
Gavin Seddon 2021-7-28
评论： Star Strider 2021-11-3
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

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采纳的回答

Star Strider
Star Strider 2021-7-28
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.
.
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Gavin Seddon
Gavin Seddon 2021-11-3
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 2021-11-3
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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更多回答（3 个）

Gavin Seddon
Gavin Seddon 2021-7-29
Hello
Yes John is correct, I tried with no parenth and I see the fun integral not its value which is wht I need.
  4 个评论
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Gavin Seddon
Gavin Seddon 2021-7-29
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 2021-7-29
Thank you!
Just curious as to what you are integrating.
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Gavin Seddon
Gavin Seddon 2021-7-29
Hello
When I searched 'vector integration' the trapezoid method came-up
yet is this correct?
Gavin Seddon
Gavin Seddon 2021-8-4
Hello
I am integrating the number of molecular motions in 10e-15s.

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