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udacity / robotics-nanodegree-issues

Public waffleboard to track Robotics Nanodegree Issues
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Controls lesson 1.5 #102

Closed dandrews7396 closed 7 years ago

dandrews7396 commented 7 years ago

quiz asks for the minimum control effort for the quadrotor to lift, to 5s.f. It accepts the answer 1.5107, which is taken from the result of gm/c (1.51074). However, as is it even stated within the code, the quadrotor will not take off until the control force is greater than gm/c. This means that the required answer of 1.5107 is incorrect and, as the actual required force is 1.51075, should be 1.5108.

kylesf commented 7 years ago

Fixed, thanks!

gurparteek commented 7 years ago

1.510741 is also greater than 1.51074, so is 1.5107400000001, the greater number need not necessarily be 1.51075. The original answer of 1.5107 was correct.

kylesf commented 7 years ago

Okay fair point, I will change back

dandrews7396 commented 7 years ago

No it's not. I'm currently mobile, but if I remember correctly, the code contains the conditional statement that it must be greater than, not equal to. If it is equal to, then that condition will not be met and it will fail. Maybe my example was flawed, but my statement still stands

On 29 Aug 2017 8:02 pm, "Kyle Stewart-Frantz" notifications@github.com wrote:

Okay fair point, I will change back

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kylesf commented 7 years ago

Made it 3 significant figures with 1.52 as answer.