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bio website carljoseph.com.au
location Australia
age 38
visits member for 3 years, 4 months
seen Oct 17 at 0:10

Business Analyst, Furniture Builder, and Astronomer in Training.


Apr
8
revised Finding points along a plot in Matlab
Added a table of sample data
Apr
8
comment Finding points along a plot in Matlab
@macydanim: This is a great help. When I replace your signal with the data I have though, it doesn't hit the points on the 50%/90% line. I'll update the question with my dataset.
Apr
8
comment Finding points along a plot in Matlab
That Matt. That's a useful start for me. Much appreciated. How would I go about getting Matlab to approximate a gaussian curve to fit the signal? From that I should be able to interpolate the 20% and 50% points.
Apr
8
asked Finding points along a plot in Matlab
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