Arithmetic Function Puns

Hi. I am lost in this.
I have a table with a string column for mathematics functions:
TABLE A.RULE = ' 0.1 * (VAL1 * 0.9 + VAL2) '

I need create a query for convert two fields to one using the user predefined rule.

Example:
SELECT d.PK, d.VAL1, d.VAL2, f.RULE, dbo.fGetRuleValue(f.RULE, d.VAL1, d.VAL2) AS RULE_VALUE
FROM dbo.TB_DATA d,
dbo.TB_FIELD f
WHERE d.FK_FIELD = f.PK_FIELD;

I try with exec('SELECT @.r = ' + @.RULE) or sys.SP_ExecuteSQL('SELECT @.r = ' + @.RULE), but functions dont can call stored procedures and dynamic procedures.

My procedure dont going to make INSERTS, DELETES, UPDATES, ALTERS, DROPS or CREATES in the database...

I'm continuing to read through the text of Software Design for Flexibility, but I'm using Racket instead of Scheme.

I've encountered the part where they rebind arithmetic operators.

(define - #| new definition ... |#)

but before doing that they are able to store the original value of -

(define n:- #| somehow look original value of '- up in the 'system-global-environment |#)

However, Racket does not seem to have system-global-environment bound.

What would be the equivalent?

EDIT: I found make-base-namespace and namespace-variable-value which seem to do the trick.

I am using them like so:

(define (base-binding sym)
  (namespace-variable-value sym #t #f (make-base-namespace)))
(define n:- (base-binding '-))

How to Achieve Accurate In-Room Quasi-Anechoic Free-Field Frequency Response Measurements Down to 10 Hz by Jeff Bagby

I have the most recent version of REW (5.20) and all of my on/off axis and far/near field measurements (taken with REW and UMM-6). I'm just wondering if I can do the same thing in REW that Jeff describes with his FRD Response Blender and Minimum Phase Extractor. Bagby's software runs in Excel, but I don't have an active subscription.

Hi, I’m very new to Prolog and because of COVID I’ve received basically no guidance in learning it. I’m also struggling to find recourses online so hopefully someone can help.

I’ve been given the program:

p(0,X,X).

p(s(Y),X,s(Z)) :- p(Y,X,Z).

We were told this used a representation of natural numbers that started with 0 and then used s(n) to represent the successor of n. And then asked to work out which arithmetic function this represents.

I’m still not really sure what it’s for and I can’t get the program to do anything useful despite trying for hours. Any help would really be appreciated.

For Exams and assignments in the said areas, contact me Discord: Cyprinus#3128 Email: cyprinuscarpio2019@gmail.com

it is pretty cool for a quick check, are you using it?

https://preview.redd.it/5o1psjngtfr51.png?width=1080&format=png&auto=webp&s=648c201a913910887f8dc9f51ee0cd97ddaec50b

So i'm gonna take my accuplacer (for William Paterson University) on the 28th of June and i've been studying for like 2 weeks now. I've done really well reviewing the first 2 sections constantly but now i'm getting through the last one and it has me pretty confused. I'm afraid that if I do poorly in that section i'll place in a remedial class far below the lowest credit college class and thus take longer to graduate (2024). Can yall also give me any ideas on what specific topics are in that last portion of the math test for those that took it? Thanks

I'm trying to find a function for this data

 x | y 
-------
 1 | 1
 2 | 1
 3 | 2
 4 | 2
 5 | 3
 6 | 3
   |

... for all natural numbers

I've tried different arrangements of modulo terms, but I can't figure it out. I've tried y = x - x mod 2 and y = x - (x+1) mod x, and they each work for only some, but not all

Announcing micromath 1.0:

• github: https://github.com/neobirth/micromath
• crates.io: https://crates.io/crates/micromath/1.0.0
• docs: https://docs.rs/micromath/

Micromath now implements most of the standard library functions for f32 which are available in std but not core for all Rust targets with a focus on embedded.

In addition to that, it provides a number of other functions including trig, stats, and quaternions, with a strong emphasis for optimizing for speed and small code size at the cost of precision.

If you're okay with sqrt(2) = 1.5 (note: precision/error ranges are meticulously documented!) and working on things like embedded platforms where speed and small code size are a must and algorithms are generally forgiving of imprecision, this is the library for you!

WASM developers: this might also be up your alley!

I know there's a simple closed form in terms of the prime factorization of n when we only conisder finite abelian groups. Have we at least proved any results about the asymptotic growth of this function?

I've been doing what research I can on Google scholar, but outside of University I'm a little limited on my access to academic journals. I am looking forward to posting some related results as soon as I know they aren't old news.

Edit: By "transforming arithmetic to analytic" I really mean rectifying the differences between them. Sorry for the poor phrasing.

Edit 2: Maybe someone with a background in Fourier analysis could help with the second question. Still looking.

Understandably, most languages use runtime errors to handle operations such as integer division by zero or square root of a negative number (when returning a non-complex number) are attempted. (In C and C++, the situation is even worse. Fundamental arithmetic may incur undefined behavior, spoiling any guarantees about the behavior of a program, and there is no way to ensure that this has not happened.) This can be very burdensome for users determined to implement comprehensive error handling. They can either wrap all of these fundamental operations in error handling code or they can attempt to write code that will never incur these errors and pray that they got it right.

I wonder if any programming language can prevent these sort of errors at compile-time by enforcing that programmers write programs which the compiler can prove cannot incur these sorts of errors.

The closest thing I know of is C used with Frama-C. I'm not an expert user, but Frama-C has an associated language for specifying pre- and post-conditions embedded alongside C code in C comments which Frama-C can statically check.

The necessary logic for such a system would obviously be applicable beyond arithmetic, but arithmetic is a nice example of where this sort of feature would be useful. Arithmetic functions are often numerous and we often want arithmetic portions of code to be performant, which is hampered by error checking.

So I need to make a function that takes an array (Not including the length of the array.), and returns 1 if it's an arithmetic sequence and 0 otherwise. Now the problem is, what's the terminating criteria of the recursion, if I don't know how many elements there are in the array, since when I plug in, I plug in just the array and not the amount of elements it has?

https://preview.redd.it/a88nephse4e21.png?width=645&format=png&auto=webp&s=a1e5ce8eee1d466a194d936a2ae3671a2ad166d8

That's what I tried to do, and that's the idea. But when do I stop?

So I succeeded, but how do I do it without entering the number of elements?

That's how I had done it when I can plug in the amount of elements.

I haven't been able to determine if this problem has a name. I'm trying to come up with a formula to generate an output given 3 inputs f(X, Y, Z) which is related to modular arithmetic.

Is it possible to find a minimal solution for n that satisfies the below relationship. Not all inputs have a solution. I can iterate to solve the issue (i.e. checking all values of n from 0 -> Z-1), but I'm looking for a more efficient path.

( X + nY ) mod Z = 0

Examples:

f(2, 4, 7) = 3, because (2 + (3*4)) mod 7 = 0

f(1, 2, 5) = 2, because (1 + (2*2)) mod 5 = 0

f(3, 6, 8) has no solution for n.