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Anybody else subscribed to CP's RSS feed? (CodeProject Latest postings for The Lounge[^]
For about a week now I longer get subject lines at all--every new entry just starts with the actual message content. Or rather, it seems like my RSS reader (Thunderbird), seeing no subject line at all, uses the message body in its place.
Other feeds, such as the Latest Articles one (CodeProject Latest Articles[^]) are ok.
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Ahhh...I was looking for that. Thanks.
[Edit] Looks like I'm not the only one to have noticed[^]
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I am looking for a website which will allow me to add sine waves.
Can someone tell me what question to ask Google ?
I know several questions that don't work.
I want to...
- Input the frequency
- Input the phase angle
- Input the amplitude (nice to have, not required)
- Click on a button
- See the resulting wave form (save as PNG or whatever would be nice)
These phrases and questions don't work...
- free online graphing tool to add two sine waves together
- online graph, adding two sine waves together
- add two sine waves together
- add two sound waves together
- Add two frequencies
- Online Tone generator
Certainly I'm not the only guy on the internet who has ever wanted this.
What question do I ask ? How do I phrase it ?
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This do it?
Wave Adder[^]
My Google query was "how to add waves graphically" and it was the 6th link.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Nice catch.
Thank you and you are voted up
My physics is messed up.
If I add two sine waves, same amplitude, same frequency, but off by 180 degrees, I'm supposed to get zero.
Wave Adder gives me a much lower amplitude, but not zero.
Am I missing something ? Maybe congress changed the laws of physics.
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maybe the Phase shift should be entered in rad and not degrees?
modified 19-Jan-21 21:04pm.
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That's it. Enter 3.14 instead of 180.
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Quote: Maybe congress changed the laws of physics.
Not Congress. It was Al Gore!
Get me coffee and no one gets hurt!
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Will you check my numbers ?
I just did...
- Amplitude 7
- Frequency 3
- Phase (zero, then 180)
The two graphs are not 180 degrees out of phase; looks like about 10 degrees.
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Radians, not degrees, I think: try 3.1415
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Bingo
When I become the King of England, I will make you a knight.
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Bingo.
OriginalGriff for president of the internet
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Does that mean I have to become racist and get a comb-over? 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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OriginalGriff wrote: Does that mean I have to become racist and get a comb-over?
Obama doesn't have a comb-over. 
The difficult we do right away...
...the impossible takes slightly longer.
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OriginalGriff wrote: Does that mean I have to become racist and get a comb-over?
Good one.
I think I laugh more often reading your comments than any other poster on this site.
Unfortunately, our nation seems to like ping-pong-ING winners and we might just get that one this time. If you wait four years we may be ready to elect another president that makes sense. (That's optimistic, we also usually re-elect the screw-ups as well as the decent ones.)
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Strangely, neither. 360° ^= 2.06 or something thereabouts.
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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Yes, now that I've learned how to click the "pi" button on Microsoft Calc, I'm home free.
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Looks like there's something weird going on with frequency and phase shift: Take 3.1415 as phase shift and then look at the graphs for the frequencies 1 and 2..
That 2.06 value I got with a frequency of 3: Look at phase shifts 0, 0.5, 1, 1.5, 2.06 ..
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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It looks fine for me: 2.06 radians as a phase shift with a frequency of 3 looks about right given that
3 * (2.06 / 2) = 3.09 ~= π
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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The effect of the phase shift should be independent of the frequency. A phase shift of π will always "flip" a sine graph horizontally. Now enter a frequency of 2 and look at the graphs for a phase shift of 0 and then 3.141 
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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See what you mean, but I see what they are doing as well.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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OriginalGriff wrote: but I see what they are doing as well.
Don't think so:
f=2, p=0 -> draw yellow, add, add -> double amplitude
f=2, p=0 -> draw yellow, add; f=2, p=3.141 -> add -> double amplitude, should be flat.
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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Wikipedia: In general, mathematically important relationships between the sine and cosine functions and the exponential function (see, for example, Euler's formula) are substantially simplified when angles are expressed in radians, rather than in degrees, grads or other units. Therefore, in most branches of mathematics beyond practical geometry, angles are generally assumed to be expressed in radians.
And that's the case in .NET or JavaScript and Java and PHP too...All except radians and not degrees...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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