MathLib | Palm OS shared math library
kandi X-RAY | MathLib Summary
kandi X-RAY | MathLib Summary
MathLib is a PalmOS shared library which makes a complete set of IEEE-754 double-precision math functions available to other PalmPilot applications. These functions include all the standard routines normally accessed by including "math.h" on other systems, including trigonometry (with inverse and hyperbolic), logarithms, exponentiation, and miscellaneous helper functions. The only standard routines I left out were the Bessel and Gamma functions, which had the poor taste to be both very large and very rarely used. These routines have been ported from the GCC 2.7.2.2 source code for libm.a (which was itself based on free code originally developed by Sun Microsystems, Inc.), so this library is free software covered by the GNU Library General Public License. There are two main advantages to using this library. Firstly, writing floating-point math functions that are reasonably fast, accurate, and robust is so incredibly difficult that few programmers will manage it on their own; hopefully, this library will spark the availability of many new programs for the Pilot that were impossible before. And secondly, as you can see from the size of this thing, floating-point code on the Pilot takes up a lot of space. It’s much better to have a single copy shared between all the programs that need it than to have each application include their own. How many copies of the trig functions (at 20 or 30 KB each) do you really want on your Pilot?. Many thanks to Ian Goldberg of Berkeley’s ISAAC Group for the excellent treatise on Pilot shared libraries that made this project possible. You should read and understand that document completely before you even think about making any changes to this library, but it’s not really necessary if you just want to call the library from your program. Note: Due to a fundamental constraint of the NewFloatMgr.lib floating point emulation library, MathLib requires version 2.0 or greater of the OS. The problem is that the floating point emulation library (which must be used in order to do IEEE 754 math under OS 1.x) requires the global variable __SoftFPSCR__, and SysLib-style shared libraries can’t have any global variables. GLib-style libraries are supposed to support globals, but can only be built or used with GCC, and I needed this library to be usable by applications written with the CodeWarrior compiler (namely MathPad and Parens). If anyone comes up with a way to build and call shared libraries using CodeWarrior on my Win98 system that will let me use the NewFloatMgr routines under OS 1.x, please let me know. Need more info? Check out the user’s manual.
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QUESTION
I want to get 20 most common words from the descriptions of top 10 longest movies from data.csv, by using Python. So far, I got top 10 longest movies, however I am unable to get most common words from those specific movies, my code just gives most common words from whole data.csv itself. I tried Counter, Pandas, Numpy, Mathlib, but I have no idea how to make Python look exactly for most common words in the specific rows and column (description of movies) of the data table
My code:
...ANSWER
Answered 2022-Mar-03 at 20:05You can select the first 10 rows of your dataframe with iloc[0:10].
In this case, the solution would look like this, with the least modification to your existing code:
QUESTION
numerator & denominator is squared when I multiply 2 times
Fraction file:
...ANSWER
Answered 2022-Jan-27 at 10:49 static int prNumer;
static int prDenom;
QUESTION
I am trying to write a simple C++ header-only library that implements some basic numerical algorithms. It's a hobbyist project, that I wish to do in my personal time.
I created a C++ MatrixX class that represents dynamic-size matrices, that is its dimensions can be supplied at run-time. Say, we create a MatrixX object as follows :
ANSWER
Answered 2021-Nov-11 at 20:39A common approach for this type of situation is to have the row() method return a proxy object that represents the row without being the row itself.
You are then free to implement how this RowProxy behaves by having its operations inspect and maninupulate the matrix it was created from.
Here's a rough starting point:
QUESTION
In lean, there exists a notation for the summation sign (Σ, large Sigma) to write sums with many terms. Sadly, neither the mathlib documentation nor the reference manual seem to provide much information about how it can be used.
What imports are required in order to use it, and how do you write sums with it?
For example, how would you write the theorem that the first n natural numbers add up to n * (n + 1) / 2, using the summation sign?
ANSWER
Answered 2021-Oct-23 at 15:34This notation is defined in algebra.big_operators.basic. Here is a minimal working example:
QUESTION
I am attempting to use Lean's mathlib, however on import it fails. When I write #print notation on a file without any import statements, it executes; if I include the same command on a file with even just a single import data.real.basic, the program hangs without printing anything. Any assistance with fixing this error would be greatly appreciated.
ANSWER
Answered 2021-Oct-01 at 21:27It was a path error.
leanproject didn't exist (or so I thought, it was actually just never added to $PATH) so I attempted to add mathlib using leanpkg.
It ended up pulling the whole thing from the git every time I tried to execute any files, and compiling it (taking upwards of an hour).
QUESTION
I am struggling to understand Template Explicit Instantiation using extern specifier. Here is my example"
// power.h
...ANSWER
Answered 2020-Nov-11 at 00:20I want to know whether this is how Explicit instantiation works or not?
Yes.
Why I get in each *.ii a definition of the template class Power?
*.ii files are result of pre-processing phase. unrelated to template instantiation.
Does this mean the class template Power is only defined but not yet instantiated and the instantiation class Power is elsewhere?
Yes, no implicit instantiation is done with the call return Power{}(side_);
If I am correct is this technique available by the new standard to avoid template code bloat?
It might reduce some, it saves compilation time, as instantiated only once. Code bloat might still happen with multiple instantiation even in single translation unit.
More detail on class_template#Explicit_instantiation
QUESTION
The code below fails verification with "failed to synthesize type class instance for ... ⊢ has_pow R R".
This seems weird because I used the same operator (^) on the same types in the enclosing scope, and there was no problem! The second theorem, with the same signature, type-checks fine.
Why does it only fail inside the rewrite? How can I fix it without changing the theorem's type signature?
...ANSWER
Answered 2020-Jun-20 at 16:20It fails because you tried to use r^x with x : R, but you'd need x : ℕ for it to work.
QUESTION
I am new to python and am trying to learn about unit testing. I am using pytest to run some unit tests on my code. Something very similar to this example:
...ANSWER
Answered 2020-Jun-04 at 20:44The short answer is no.
Testing a function depends on the ability to
- observe changes caused by the function to the state of the program or
- access the return value of the function.
So, if a function's behavior changes the state of a program and we need to test this behavior, then we need to be able to access the part of the state that is changed to test the corresponding behavior. Such tests may not always rely on the return value of the function. Hence, functions need not return value to be testable but they do need to expose information pertaining to their behaviors that need to be tested.
For more on this aspect of testing, read about test doubles. "Using test doubles" chapter about indirect inputs and outputs in "xUnit Test Patterns" book is a good reference.
QUESTION
I am currently working on my own Vector class for the purpose of learning C++ and got stuck here.
The error happens in my implementation of the overloaded -= operator. Because the subtraction of two vectors is similar to adding two vectors but using the negative, I try to reuse the code from the += operator by utilizing the - operator. Little confusing to write... so what I mean here... instead of directly implementing
v1 - v2
I want to implement
v1 + (-v2)
This is the code stripped down to the essential parts:
...ANSWER
Answered 2020-May-30 at 18:11There is a bug in your operator+=(const Vector3& v). It performs assignment, but not the addition.
As for the unary - operator, if you want to use it in the class body, it should be accessible from the class body. Basically, you need to define you unary - operator
QUESTION
I am trying to make a code called iPIC3D and it has some prerequisite libraries such as HDF5, H5hut etc. I did everything as instructed. One has to install all the prerequisites and then run the "make" command. But while running the make command, I get a series of errors such as
...ANSWER
Answered 2020-Mar-09 at 14:32I would say you are missing linking in the libz library as this is where the compress2 function should come from. Try adding -lz to your LDLIBS.
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