Recent content by nmf77

number of pieces * area * thickness gives you the volume of paint in cubic metres. Multiply this answer by 1000 to convert to litres and you have your answer. I didn't understand your last step. I think the area you calculated for each piece may also be wrong ... 0.58 * 0.73 = 0.423 sq...

the subtraction 'method' looks like hard work to me! Starting with 12, if you add, in succession, the numbers 3,5,10 and 2, you reach a total of 32. Hence the answer to 32-12 is equal to the sum of those numbers - 20. The choice of numbers to add seems somewhat arbitrary, save for the fact...

true, unless you form a skew symmetric matrix from a vector, which is a common way to compute cross products

Are you trying to find the acceleration/deceleration profile that minimises the time of travel, or are there some other constraints perhaps?

I think of the +/- as the uncertainty in the measurement in a statistical sense. This may be a subtlety different view to that posted above. I don't interpret those bounds as definitely encompassing the 'true measurement'. Usually I'd take it to mean that there's a 68% chance (1 sigma) that...

Thank you DH, that's a very comprehensive answer that will take me some time to digest. I'll start tomorrow! Many thanks

Hi DH hope you don't mind me resurrecting this thread but something you posted caught my interest. I work in this field but like many of my colleagues my knowledge is practical rather than deeply rooted in the mathematical background. I know about the practical issues with using quaternion...

This link may help ... http://en.wikipedia.org/wiki/Euler_angles I'm sure the PF contributors can cover this topic perfectly well, but you may also want to look further afield. This question crops up all the time in the field of navigation, so resources related to that area may also shed some...

something worries me slightly about your original equation ... I'm not sure it looks sensible in terms of dimensions/units. You have one term on the left (acceleration), and three terms on the right. The third term on the right is velocity I think, which obviously is dimensionally different to...

is there a specific question you need to answer in respect of this data, or is it just a commentary you're after? Questions I'd be asking / thinking about would include the following; 1. Are you actively controlling the pressure variable during data gathering, or are these just measurements of...

I assume that the rotations around X and Y will be achieved by applying by two separate quaternion increments, call them QX and QY. Assuming this is the case I think you need to proceed as follows; 1. apply the QX rotation to Q1, call the result R1. 2. apply the QX rotation to the QY rotation...

Hi, thanks for the reply. I'm using a Matlab script. I wrote the script but it's a straight lift from textbook least squares in matrix form. Basically it's this; observations are in vector b, A is the 'design matrix' and x is the vector of fitting variables. So b = Ax + v (v contains the...

Hi, I wonder if someone could give me some guidance on this problem please. I'm not a mathematician and I'm not even sure what the title of this problem should be - curve fitting, regression, function minimization? It started with something fairly simple, least squares fitting with 3...