Scratch

Yeah i like math, can i join?

Hardmath123 wrote:

scimonster wrote:

Hardmath123 wrote:

Here are the features we need in the setup engine:

•Converts the input to a list
  ~Keeps numbers and operation names like sin and sqrt as 1 item.
  ~Ex: Converts sqrt 1 + 2 into:
      ·sqrt
      ·1
      ·+
      ·2
•Ignores anything that isn't a number or an operator's symbol
•Replaces (a+b)(a-b) with (a+b)*(a-b)
•Ignores commas in numbers: 1,000 converts to 1000
•Checks for mismatched brackets

Let's add to this list, then start on the setup engine—we ought to finish it by next week.

OK, I'm a bit busy but I'll try to start that soon. 

Don't start yet—let's first complete this list.

I didn't. What else is there to add?

We need it to change "x" to *, so if a user types 6 x 1 it can convert to 6*1.

hpotter134 wrote:

Hey guys! I decided to try and go through with the postfix and see how far that took me. Here is the result of that. But since the general public is against that approach, you need only to take a look at the "tokenisation" aspect. It separates the problem into numbers, decimals, operators and IBFs (in-built functions) It also tells apart strings and gives NUL for unrecognized symbols.

I think this is what you guys were talking about.    Correct me if I'm wrong.

At this point it looks like the project is done.  Now we call on applejack to make some awesome graphics, and we're set?  I still think it would look nicest 0s1s..

amcerbu wrote:

hpotter134 wrote:

Hey guys! I decided to try and go through with the postfix and see how far that took me. Here is the result of that. But since the general public is against that approach, you need only to take a look at the "tokenisation" aspect. It separates the problem into numbers, decimals, operators and IBFs (in-built functions) It also tells apart strings and gives NUL for unrecognized symbols.

I think this is what you guys were talking about.    Correct me if I'm wrong.

At this point it looks like the project is done.  Now we call on applejack to make some awesome graphics, and we're set?  I still think it would look nicest 0s1s..

No way. We're a team. It's not a collaboration if one person makes the whole thing.

Hardmath123 wrote:

Hardmath123 wrote:

Here are the features we need in the setup engine:

•Converts the input to a list
  ~Keeps numbers and operation names like sin and sqrt as 1 item.
  ~Ex: Converts sqrt 1 + 2 into:
      ·sqrt
      ·1
      ·+
      ·2
•Ignores anything that isn't a number or an operator's symbol
•Replaces (a+b)(a-b) with (a+b)*(a-b)
•Ignores commas in numbers: 1,000 converts to 1000
•Checks for mismatched brackets
•Replaces constants' names or symbols with values:
pi => 3.141592653
π => 3.141592653

Let's add to this list, then start on the setup engine—we ought to finish it by next week.

Somebody make an engine to do only the above, please.

I'm sorry. I'm new to this whole collaboration thing. Here is an engine that I think does what you want, and only what you want. Please download it or view it in Flash player, for I don't think it works in the Java player.

Ha! I knew it sounded familiar.

shadow_7283 wrote:

Interesting.... Xenon is also the name of one of Intel's processors.

What about fractional exponents? radicals can have more than one solution,  should it support all?

Hardmath123 wrote:

Here are the features we need in the setup engine:

•Converts the input to a list
  ~Keeps numbers and operation names like sin and sqrt as 1 item.
  ~Ex: Converts sqrt 1 + 2 into:
      ·sqrt
      ·1
      ·+
      ·2
•Ignores anything that isn't a number or an operator's symbol
•Replaces (a+b)(a-b) with (a+b)*(a-b)
•Ignores commas in numbers: 1,000 converts to 1000
•Checks for mismatched brackets
•Replaces constants' names or symbols wiht values:
pi => 3.141592653
π => 3.141592653

Let's add to this list, then start on the setup engine—we ought to finish it by next week.

Tell me what to do.

Okay, thanks.

How bout they choose a mode (+, -, *, /) and then pick numbers. each time a button is clicked it adds/subtracts/multiplies/divides a 'answer' variable.

Last edited by ProgrammingFreak (2011-04-18 16:07:21)

ProgrammingFreak wrote:

Okay, thanks.

How bout they choose a mode (+, -, *, /) and then pick numbers. each time a button is clicked it adds/subtracts/multiplies/divides a 'answer' variable.

Actually, the whole point of this project is in creating a program that evaluates an expression.  For example, the user puts in 3+4*2/(1−5)^2 and the program returns a value (in this case, 3.5), using order of operations, etc.  There are many projects on Scratch that use the "choose a mode" method, but this is easier for the user and can support more complex problems.

Last edited by amcerbu (2011-04-18 23:46:46)

scimonster wrote:

Hardmath123 wrote:

scimonster wrote:

OK, I'm a bit busy but I'll try to start that soon. 

Don't start yet—let's first complete this list.

I didn't. What else is there to add?

Well couldn't we add functions like negatives and things in the order of mean, median,mode

Okay, I'm going to assign a few jobs:

Hardmath123: I'm going to build the string-list setup engine

scimonster: Once I'm done, remove commas (like in 1,000) and replace constant's names with values.

applejack: Make specific error backgrounds

amercbu: Once sci's done, add something to test for mismatched brackets and when you have something like 5√2 or (1)(2) replace them with 5*√2 or (1)*(2)

hpotter134: Once amercbu's done, add something to report the innermost nested bracket set. So 1+(2+3) would report 2+3

Last edited by Hardmath123 (2011-04-20 05:13:31)