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

Business Analyst, Furniture Builder, and Astronomer in Training.


Apr
14
awarded  Popular Question
Mar
26
comment Fourier transform for dummies
Here's a video I made a while ago describing the fourier series and fourier transform. It's a bit of a light hearted approach. youtube.com/watch?v=Qm84XIoTy0s
Nov
27
awarded  Notable Question
Oct
3
awarded  Popular Question
Aug
19
awarded  Notable Question
May
25
comment Submit papers: arxiv or vixra?
I hate you people. I just spent an hour reading astrophysics papers on viXra. Who the hell is Jeffrey Joseph Wolynski? Woah!
Apr
25
accepted Finding uncertainty in the slope/intercept for a non-linear least squares fit
Apr
24
revised Finding uncertainty in the slope/intercept for a non-linear least squares fit
added 12 characters in body
Apr
24
comment Finding uncertainty in the slope/intercept for a non-linear least squares fit
thanks again. I have finally worked through your solution and arrived as a $\pm$ value. See my updated question as I still have some queries I am uncertain of.
Apr
24
revised Finding uncertainty in the slope/intercept for a non-linear least squares fit
Provided better data for the table, clarified some of the algebra letters, and provided an update.
Apr
19
comment Finding uncertainty in the slope/intercept for a non-linear least squares fit
Thanks for that. Just wanted to check that in your last equation you intended $\hat\sigma$ and not $\hat\sigma^2$. So $\hat\sigma$ is $\sqrt{\hat\sigma^2}$
Apr
18
comment Finding uncertainty in the slope/intercept for a non-linear least squares fit
Thanks for that. I'm not familiar with the notation, but it's making some sense. Wondering though, what is $\hat\sigma$
Apr
18
asked Finding uncertainty in the slope/intercept for a non-linear least squares fit
Apr
8
comment Finding points along a plot in Matlab
@macydanim: One more small question. What would I need in order to match a polynomial to it instead of finding a straight-line match?
Apr
8
comment Finding points along a plot in Matlab
@macydanim Thanks once again. I've adapted it for my specific needs and it seems to work quite well. Thanks.
Apr
8
accepted Finding points along a plot in Matlab
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