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Topics - calcdude84se

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General Calculator Help / Normal lines and a slider
« on: April 14, 2012, 10:04:42 pm »
I'm posting on behalf of HavokDelt on IRC, who doesn't currently have access to a GUI to be able to post. I'm going to pretend it's my problem for easier reading.
So, I want to create a slider that will draw the normal line to a parametric curve at a given time.
My current setup is this: a and b are y and x for the parametric curve, and are defined in terms of t. The variable y and x themselves represent the line. byx represents the slope of the tangent line, calculated as "da/dt*(db/dt)^-1". So, the line is "y=a+byx^-1*(x-b)".
The problem is this: while byx gives the expression for the derivative just fine when t is not defined, when the slider is in use t is given a numeric value. Because of that, a and b are no longer expressions, but values, so da/dt and db/dt are both 0, and byx is undefined.
Now, another calculator I have has an Exchange function that replaces one variable with another, say t with k, and I can use it to make a similar thing work there.
But how can I do this on the Nspire?

OmnomIRC Development / Joined channels not persistent across pages
« on: November 27, 2011, 04:49:29 pm »
Whenever I change pages, other channels that I have joined (such as those created by "/j test") are no longer in the channel switcher at the top of the OmnomIRC frame. However, if I'm in one of the five standard channels, that choice is persistent across pages.
Sounds like a cookie problem.
Edit: I'm using Firefox 8, by the way.

I'm using Firefox with an extension for enabling HTML5 notifications. This causes the "Chrome Notifications" entry to show up in OmnomIRC options. However, this also causes "Clear cookies" to overlap with "<- Back"
I do not know if this is also the case with Chrome. Whether it is or not, the overlap shouldn't be there.

Axe / MOVED: My calculator will not turn off
« on: October 28, 2011, 10:51:35 pm »
This topic has been moved to General Calculator Help.

Other / MOVED: Essay : Disadvantages and advantages of networks
« on: October 24, 2011, 07:47:51 pm »
This topic has been moved to Humor And Jokes.

Humour and Jokes / MOVED: Taylor Mali - God Tier Poet
« on: August 28, 2011, 09:59:16 am »
This topic has been moved to Miscellaneous Discussion.

Other Calculators / MOVED: Signed Operating Systems - Who needs them?
« on: August 23, 2011, 06:35:14 pm »
This topic has been moved to News.

TI Z80 / Screenshot Hook
« on: August 19, 2011, 07:23:48 pm »
I saw this post and decided to write a keyhook that puts the current LCD contents into a pic variable.
You install it by running prgmASAVEPIC and take a screenshot by holding [ON] and pressing a key from 0 to 9.
Currently it has basic functionality and is useful, but be aware of the following limitations (some of which I can fix and will probably get around to fixing):
Although you can start it, there is currently no specific way to get rid of the hook. If you have CalcSys, you can manually reset bit 0 of (iy+$34), but other than that the only way to get rid of it is a RAM reset. (Though it works fine and there's no reason to remove it :P)
It doesn't chain the current keyhook. It can probably be successfully chained, though, so for apps that have keyhooks and do chain them, you just have to install my hook first.
It overwrites picvars in RAM, and will not take a screenshot if the picvar is in flash. These are both intended.
It will create picture variables as necessary, but will not if there is no free RAM. This is only a problem when free RAM could be gotten, i.e. when the edit buffer is open (e.g. on the home screen). I'll look into making it work when the edit buffer is open.
It saves 768 bytes. If the picvar chosen already exists, but is only 767 bytes (as viewed from the memory menu), it will overwrite 12 bytes of RAM. Make sure they are 779 bytes.
It only works within bcall(_GetKey). This is a result of using the GetCSC hook. You probably won't be able to use it in most of your favorite ASM programs.
In the ASM programs in which it does work, it carries the potential to break them if they expect OP1 to remain intact across a bcall(_GetKey)

Other than that, have fun! (The .8xp is a binary, .8xv is Mimas-format source (yay!), and .z80 is said .8xv converted)
(Note that you can use it on the homescreen or in the program editor, you just need to have a 779-byte picvar in RAM first.)

Miscellaneous / MOVED: spambot topics
« on: August 19, 2011, 12:07:32 pm »
This topic has been moved to Spam.

This topic has been moved to News.

Site Feedback and Questions / SSL
« on: August 03, 2011, 02:02:47 am »
Admins, any chance that Omni could also support SSL? (So that etc. work?)

OmnomIRC Development / Chrome notifications and colors
« on: July 25, 2011, 11:49:38 am »
Chrome notifications do not work well with colors. The notification is given without being HTML-ified like in OmnomIRC, so colors (and presumably use of bold and underlining) don't work. (For colors, for example, there's a \x03 for every color change, including also the color code.)

Other / MOVED: New RSA Algorithm discussion
« on: July 15, 2011, 05:50:30 am »
This topic has been moved to Math and Science.

Miscellaneous / One year on Omni
« on: June 01, 2011, 10:46:31 pm »
All right, it's a bit late (over a month), but it seems that I've been here for over a year now! :w00t:
Overall, I've been enjoying Omnimaga since day 2. (Not day 1 since I was still figuring things out :P)
So, not being the type of person to post long reflections (at least not for the most part), I'll just thank everyone here for being awesome, especially our COT and Admins ;D

Site Feedback and Questions / Random Topic Button
« on: May 15, 2011, 01:30:52 pm »
I doubt this will ever get implemented, but just a random feature request that came to me: could there be a button that takes one to a random unread topic?
I'm only asking because I think it would make browsing new posts more interesting ;D

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