[PD] Calculating Inverse Kinematics Using Expr

[me.grimm]

hey matt yeah that does work out correctly. thank for the help...

i figured i was using the "^" operator wrong here....

cheers
m

On Wed, Jan 25, 2017 at 11:10 AM, Matt Barber <brbrofsvl at gmail.com> wrote:

> In expr, ^ is bitwise-exclusive-or, but you want exponentiation. Just
> replace $f1^2 with $f1*$f1.
>
> On Wed, Jan 25, 2017 at 11:03 AM, me.grimm <megrimm at gmail.com> wrote:
>
>> Hello,
>>
>> I am trying to calculate inverse kinematics in 2D space with 2 DOF
>> according to this tutorial(1) and formulas within using [expr]. For some
>> reason my calculations for "c2" using [expr] deliver quite a different
>> result than the excel sheet calculation that the tutorial provides.
>>
>> What am I doing wrong here? It may be I don't quite understand how "^" is
>> used?
>>
>> Using:
>> Linkage 1 length of 5
>> Linkage 2 length of 4
>>
>> and plotting my the end of joint 2 at (3.56, 6.43) I should get c2 to
>> equal 0.3254625 but get 0.25 with [expr]. Because of this further
>> calculations to get joint angles are also off, obviously.
>>
>> attached is patch.
>>
>> but maybe someone has already done this type of work which might save me
>> some trouble...
>>
>> cheers
>> m
>>
>>
>> (1) http://www.societyofrobots.com/robot_arm_tutorial.shtml#
>> inverse_kinematics
>>
>> --
>> ____________________
>> m.e.grimm, m.f.a, ed.m.
>> syracuse u., tc3
>> megrimm.net
>> ____________________
>>
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>


-- 
____________________
m.e.grimm, m.f.a, ed.m.
syracuse u., tc3
megrimm.net
____________________
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