165 reputation
211
bio website carljoseph.com.au
location Australia
age 37
visits member for 3 years, 1 month
seen Jun 17 at 5:36

Business Analyst, Furniture Builder, and Astronomer in Training.


Mar
23
accepted Solving the inverse of cos^2
Mar
22
comment Solving the inverse of cos^2
Done. Keen for an edit on that if I have anything wrong. Thanks again for the guidance, it really helps to break these things down for me.
Mar
22
revised Solving the inverse of cos^2
Updated to include a hint provided by DonAntonio
Mar
22
comment Solving the inverse of cos^2
Very helpful. Thanks for that Don. So after substituting the alternative, I can solve for i. I might update the question to include this as it's easier to do formulas in there.
Mar
22
comment Solving the inverse of cos^2
I'm just not familiar with the notation (was daydreaming during my trig classes unfortunately). So cos^2(i) is the same as [cos(i)]^2?
Mar
22
asked Solving the inverse of cos^2
Mar
15
awarded  Popular Question
Nov
11
accepted Finding outliers in a linear series
Nov
11
comment Finding outliers in a linear series
Thanks for that Peter. I've used option 2 and the results are pretty clear to me now.
Nov
11
asked Finding outliers in a linear series
Oct
17
accepted Finding the value which minimises all residuals
Oct
17
comment Finding the value which minimises all residuals
Excellent. Thank you very much for that explanation. It helps immensely.
Oct
17
comment Finding the value which minimises all residuals
Thanks Ross. A few things are confusing me here ... Shouldn't I be calculating $tan(\Delta RA)$ at each time, and comparing it with the result of the right term of the model? I then get the differences between the observed results and the model predicted results (right term), sum of their squares, and try to minimise that sum by Goal Seeking for different values of $R$. Does that sound right to you?
Oct
16
revised Finding the value which minimises all residuals
edited tags
Oct
15
revised Finding the value which minimises all residuals
cleared up the text
Oct
14
asked Finding the value which minimises all residuals
Sep
29
awarded  Commentator
Sep
29
comment Multiple variables with multiple solutions
Hi Berci. Thanks for that idea too. I would love to add in another condition, but in this particular instance, I can't. Otherwise it might certainly make it easier to restrict the values of $x, y, z$.
Sep
29
accepted Multiple variables with multiple solutions
Sep
29
comment Multiple variables with multiple solutions
Thanks for the further explanation. That makes sense now. Yes, $x, y, z \ge 0$. I guess rearranging the equation to solve for $x$ or $y$ would be tricky?