(Graphing) Calculators for the PC

January 22, 2008

Recently, I decided to search for a better calculator than the one that ships standard with Windows. That’s when I discovered two wonderful programs; each is a little different from the other, but they complement each other quite well.

  •  Calcute: This program is basically a tape calculator for computers. Type in an equation. Go back and edit it if you want; it’s not a problem because everything you typed is on the screen for you to fix in case you made a mistake. When you’re done, press enter and voila! the answer appears.
    Calcute Animated GIF
    Do you need to go back and fix what you calculated? Not a problem, and you can even save your old answer. Need more space? Calcute can fill the whole screen if you so desire. Calcute also makes adding long lists of numbers a snap. This is a must-have for anyone with an accounting class; of course, it’s free.
  • Graphcalc: For the more experienced user, there is a calculator that  is even more powerful, if not a little more difficult to use.
    3dgraph.gif2d graphcalc graph
    As you can see here, Graphcal not only can add, subtract, etc, but it can also create on-screen graphs, both two-dimensional and three-dimensional. These graphs render instantly, especially compared to calculators, and handle roughly the same mathematical manipulations as graphs made by TI brand calculators.
    I’m not a big fan of the 3d graph yet, except (of course) enjoying that it renders in multiple colors and can be twisted around like a new toy.

Bibliography Help

January 22, 2008

Do you need to turn in a bibliography (list of Sources Cited) soon, and you don’t know how to make bibliographies? Well, friend, don’t worry, because a website has solved your problem for you.

That website is easybib.com, and they make it easy to create bibliographies. All you do is fill in the blanks and they provide you with the formatted output. Once you create entries, you can also edit or delete them at your leisure.

Its only downside is not being able to save your bibliographies once created. They’re still working on that. The big brother to the free edition is MyBib Pro: it’s cheap at $7.99 a year, but even that price isn’t worth it for a quick fix of citations.


Circle and Sphere

November 2, 2007

The formula of a circle can be explained by the equation

x^2+y^2=r^2,

simplified,

y =+/-  sqrt(r^2-x^2)

but if you wanted this equation in a calculator, you must also include the negative square root. You would have to write two equations:

y1 = sqrt(r^2-x^2)
y 2= -sqrt(r^2-x^2)

On a TI graphing calculator, you can also use this combination to define a single equation.

y1 = {1,-1}sqrt(r^2-x^2)

If 3D graphing capabilities are available on your calculator (such as the TI-92, possibly the TI-89, and any TI 83 or 84 with the program Graph3 installed), you can create a three-dimensional sphere, or at least half of one. The generic equation for a sphere is:

r^2 = x^2 + y^2 + z^2

 Simplified,

z = +/- sqrt(r^2 – x^2 – y^2)

Again, the equation can be typed in on two separate y= or in the form y1={1,-1}sqrt(…). But in the case of the program Graph3, you must be content with only half of the sphere.


Bad Day

April 11, 2007

Today was a remarkably bad day. It started off at school during first hour. Not even. Before our regular classes, we were called to homeroom, and before school began, this is where I was, looking around. With no warning, one of the lenses of my glasses popped out. I lost the screw but (thank God) not the lens. After taking the recusant lens to my locker and getting back to class, I picked up a pen so that I could study and write some more in preparation for my History test. The pen was even faultier than my glasses (if such were possible). It spurted ink onto both of my hands at such levels that I was tempted to discard of it and clean my hands, if it was not the only writing utensil that I had. 

In Social Studies, there was indeed a test, one that, after the day’s events, I had not felt remarkably ready to attempt. But I attempted, and the results of which I can only expect to be disastrous. I felt a little better by wasting my mind away on a computer during study hall, but as I left (for lunch), what was left of my glasses managed to fall to the floor. I was so caught up in the crowd that I barely retrieved them. 

I was prepared to turn in a large project (job shadowing) for accounting, and, lo and behold, when I checked through my work I found that the three-page report I had typed the day before contained an enormous error — it had ommitted half of Page Two. And on top of that, I had come to class late, and without a pencil.  I was fortunate enough to borrow a pencil from the girl who sat behind me in that class. She noticed my dilemma and commented, “It must be your Friday the Thirteenth.” Tell me about it. She let me keep the pencil. Just to end the day on a bad note, I had forgotten my glasses (safely secured in my locker) at the end of it all. I turn up from school now feeling just a little bit miserable with only the hope of a good meal driving me on.


Empirical Formula

January 16, 2007
  1. Change percent to grams. This can be done because percent is based on 100. 63% Mn and 37% O, with 100 grams would be 63g Mn and 37g O. If given grams, leave as grams.
  2. Convert grams to moles
  3. Get mole ratio by dividing each # of moles by the smallest #. It’s okay to round by as much as .15 when getting this ration. 1.90 can be rounded to 2, 3.13 can be rounded to 3, etc.
  4. Adjust the mole ratio to get whole numbers. Multiply by 2 to get rid of a half (.5), by 3 to get rid of a third (.33), or by 4 to get rid of a quarter (.25). This step doesn’t happen all the time.
  5. Write the formula. Remember that the metal always goes first. If you have 3+ elements you have to decide which polyatomic ion is being used. (The element with the smallest electronegativity is otherwise written first.)

story?

September 20, 2006

I’m not even going to bother explaining this, it’s a story. Enjoy. 

            For a time, I went to a different school. My father had found it a simple transition, since he had always worked at the school anyway. Now all he needed to do was drive to one destination, and he had accounted for both his transportation needs and mine.

 Naturally, I had different feelings on the matter. I was a little taken aback by the size of the classroom: it had more than twice the number of students to which I had become accustomed, and that classroom did not even hold the entire grade. It was also a confusing ordeal, to walk between classes at this new school. I even missed the uniforms that my old school had required us to wear.

            You could say that I was an oddball back then. I have not altered that characteristic over the years. I did not really mind my perplexing personality, as long as I could be successful in school, and as long as I had friends.

            The first friend I made in these foreign surroundings was a fellow named
Tyler. Looking back on it now, I cannot really understand why we were friends. We were opposites in almost every way. He preferred being relaxed and laid back, while I chose a regulated, tenser lifestyle. I was a proponent of academics (and I strove to maintain the point), while he was content with wandering through life at a pace totally his own.
 

           In that school district, music was a mandatory class, not just a suggestion. Almost everyone in my hour was struggling to recall names of various notes and where in the clef they belonged.  Perhaps I knew a little too much about music, because the teacher (in admirable attempt to get the oil to the squeaky wheel) finally put me aside after a few rounds of read-the-note. She sat me down in front of a computer with music creation tools, and instructed me to compose anything. I caught Tyler’s eye. He shrugged, his expression of amusement. 

           Now I was, regardless of how much I hated to admit it, as stumped as anyone. The faint smell of static electricity wafted from the startled screen. I could hear the inside of the computer now, gears crunching together as I attempted to utilise the program. “It” seemed to take my every command as a sarcastic joke, backtracking two steps for every inch of progress I made. In frustration, I eventually cried “uncle” and went to observe the rest of my class. 

           The hour wrapped up, though none too soon. There was only one more period that day, after which I could run (some things never change) to my father’s classroom and use computers in a way I did understand – through games.

            A surprise awaited me, however. When I arrived at my father’s classroom, the door was closed and locked. My piano book bag sat at the foot of the door, waiting patiently. I picked it up from the ground and headed to the place I hoped had musical instruments.

Here it is another piano just like any other one and my books in a bag just dump them out and grab the first one put it on the piano open straighten look read put my hands to the keys and play.

 I have absolutely no idea what I was playing at the time, mostly because it really didn’t matter. Beautiful and simple music echoed around the small room, bouncing from every wall and occasionally crawling out, unnoticed, through a small crack under the door.   

         A janitor must have heard me, for he opened the door, allowing a whoosh of air into the room. I turned to meet the newcomer.  

          “That’s excellent work,” said he. “How long have you been playing?”

            “It’s only been a year – not even.”

I’m about to say more, but he interrupts. “It’s a rare thing in this school to hear the sound of a piano. It’s been maybe even five or six years since someone last taught that instrument. The school board said that it was just severely difficult to maintain, and consumed too much space.”

“My parents’ friends always told me that the piano was too large an instrument for me to carry around, too,” I replied. “But I found that wherever I go, there’s already a piano there, waiting to be played.”

“Good point.” He smiled. “Who taught you that mindset?”

“Say what?”
            “I mean, who’s your piano teacher?”

Oh, he’s Mr. Lueptow, but you probably wouldn’t know him because he’s from…”

Lueptow, you say? Then he’s the same person that used to teach piano here!”We talked there a little longer, lingering on the connection that had brought us together. All too soon, it was time for him to get back to work. Before he left, thought, his last statement caught me off-guard: “Never stop playing the piano. You’ll be glad you put forth the effort someday.” 

            I remember his statement as I sit here now, breathing the aroma of coffee. I relax my grip on the Styrofoam cup in my hand and turn my attention to the voices around me. All the sounds of chatter are indistinct and woven together; indecipherable by all except the people engaged in conversation. It is a small church but a social one. A person or two have already come up to me, said “Thank you, thank you,” or, “Excellent job.” And what could I say in response? I nod, smile, and tell them that it’s what I enjoy to do.

            Now someone else distinguishes their voice from the jumble. “That was good work, but I was expecting you to play some more classical music, just like when you biked here last time.” One or two more murmur in quiet agreement. I take another sip of coffee: strong, sweet warmth flows through my body.  

           I remember Tyler. After the year I met him, I never saw him again. I remembered the computer game that I played that year. I’ve moved on since then, becoming a programmer instead of a gamer. As for my school, I did not even attend it the next year. Now there is only one thing that remains from my memories that has stood the test of time.I arise and stroll to the embattled old piano.And I play.


Stream of Thought

September 15, 2006

Don’t read this unlesss you are willing to be offended by lots of formatting errors… It’s a stream of thought! It isn’t supposed to be conventional.

Here I have a piano so where’s the bench a little too close, move it back some turn the bookbag over pick up the first music book open it up put your hands on the keyboard read what it says and play like it’s a concert all the world sees it and God is in the front row watching the performance.


Significant digits?

September 14, 2006

Whether or not the number zero is a significant digit or not is always a question. Here’s a simplification:

  • Middle zeroes are always significant.
    Example: 302 has three significant digits.
  • Leading zeroes are never significant.
    Example: .05 has one significant digit.
  • Trailing zeroes are significant if theyr’e to the right of the decimal, or to the left of the decimal.
    Example: 8050 has three significant digits.
    Example: 8050. has four significant digits.
    Example: 8050.0 has five significant digits.

Or, instead, you can look at what kind of number you’re looking at.

  • Nondecimal: Start at the right, go to the first nonzero digit. It’s significant, and so is everything to the left of it.
    Example: 10500 has three.
  • Decimal <1: Start at the left, go to the first nonzero digit. It’s significant, and so is everything to the right of it.
    Example: .009090 has four.
  • Decimal >1: Everything is significant. Easy.
    101.01010 has eight.

Steps in the Accounting Cycle

September 12, 2006
  1. Collect and verify source documents
  2. Anylize each transaction
  3. Journalize each transaction
  4. Post to the general and subsidiary ledgers
  5. Prepare a trial balance (from here, you can go to the beginning… I really don’t see why you’d want to after being half-done.)
  6. Prepare a work sheet
  7.  Prepare financial statements
  8. Journalize and post the adjusting entries
  9. Journalize and post the closing entries
  10. Prepare a post-closing trial balance

(with many thanks to my Accounting teacher for letting me write here during her class)


Being a successful student… any other way.

September 8, 2006

Some of the things that Murphy (from Murphy’s Law) would tell us not to do in order to succeed in life, and class.

  • Do not wait until the last day to read 50 pages of text, write three, and then find out it was really due next week. (I have done this. I concur. AP History is so confusing!)
  • Do not forget the assignment at home and then work to remember the exact answers… especially if it’s in the format of a 30-part list. (I did that too… recovering from it right now… *shakes*)
  • Do not take a stupid class like computer studies when you can take Computer Programming instead! A Junior-level class beats a Freshman-level class, any day.