taylor | Explorations of compiling Swift code
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QUESTION
I am using taylor.diagram in R to evaluate the model performance. The below codes can make a sample taylor.diagram plot:
...ANSWER
Answered 2021-Jun-10 at 13:27The Taylor diagram is a visualization tool and although it calculates this metrics you cannot access them. You can calculate them using R.
QUESTION
I am building a gallery where you click on the image and it will load in a separate component using props, this image is a URL, taken from an array, where the src property is loaded as a background image via CSS. My challenge is connecting the src data to the child component. See original question
I have found a solution to pass the data using the Link component. Now the URL string is being read like this: http://localhost:3000/https://photos.smugmug.com/photos....
As you can see there is an address within the address in the string.
I have tried changing the state of the URL string but did not work.
My question, how do I write a redirect to fix the HTTP address removing the localhost address
UPDATE Many thanks to Taylor, Drew, and Ajeet for all of your help! The solution is posted below, the main issue was I needed a function in the Image component to connect the src props from the GalleryContainer component. I also changed all "a tags" to "Link components" to keep consistency. More details are in the explained solutions from Drew and Taylor, and also Ajeet code box here
...ANSWER
Answered 2021-Jun-05 at 07:28You can simply use a tag to redirect.
QUESTION
I am looking to take the log base n (10 would be fine) of a 256 bit unsigned integer as a floating point in rust, with no loss of precision. It would seem to me that I need to implement an 8xf64 512 bit float 512 type and use a Taylor series to approximate ln and then the log. I know there are assembly methods to obtain the log of an f64. I am wondering if anyone on stack overflow can think of a divide and conquer or other method which would be more efficient. I would be amenable to inline assembly operating on the 8xf64 512 bit array.
...ANSWER
Answered 2021-Jun-06 at 23:41This might be a useful starting point / outline of an algorithm. IDK if it will get you exact results, like error <= 0.5ulp (i.e. the last bit of the mantissa of your 512-bit float correctly rounded), or even error <= 1 ulp. Perhaps worth looking into what extended-precision calculators like bc / dc / calc do.
I think log converges quickly, so if you're going to do Newton iterations to refine, this bit-scan method might be a fast way to get a good starting point. Even if you only really need about 256 mantissa bits correct, I don't know how big a polynomial it would take to get that, and each multiply / add / fma would be on 512-bit (8x) or 320-bit (5x double precision).
For normal-sized floating-point numbers, the usual method takes advantage of the logarithmic nature of binary floating point. Without 256-bit HW float, you'll want to find the ilog2(int) yourself, i.e. position of the highest set bit (Efficiently find least significant set bit in a large array?).
Then treat your 256-bit integer as the mantissa of a number in the [1..2) or [0.5 .. 1) range, and yes use a polynomial approximation for log2() that's accurate over that limited range. (Before actual soft-float stuff, you might want to left-shift the number so it's normalized, i.e. the highest set bit is at the top. i.e. x <<= clz(x).
And then add the integer exponent + log_approx(mantissa) => log2(x).
Efficient implementation of log2(__m256d) in AVX2 has more detail on implementing log2(double) (with SIMD doing 4 at a time, very different from doing one extended precision calculation).
It includes some links to implementations, e.g. Agner Fog's VCL using the ratio of two polynomials instead of one larger polynomial, and various tricks to maintain as much precision as possible: https://github.com/vectorclass/version2/blob/9874e4bfc7a0919fda16596144d393da5f8bf6c0/vectormath_exp.h#L942. Such as further range reduction: if x > SQRT2*0.5, then increment the exponent and double the mantissa. (If 512-bit FP division is really expensive, you might just use more terms in one polynomial.) VCL is currently Apache licensed, so feel free to copy as much as you want from it into anything.
IDK if there are more tricks that might become more valuable for big extended precision, or for soft-float, which that implementation doesn't use. VCL's math functions spend more effort to maintain high precision than some faster approximations, but they're not exact.
Do you really need 512-bit float? Maybe only 320-bit (5x double)?If you don't need more exponent-range than a double, you might be able to extend the double-double-arithmetic technique to wider floats, taking advantage of hardware FP to get 52 or 53 mantissa bits per 64-bit chunk. (From comments, apparently you're already planning to do that.)
You might not need 512-bit float to have sufficient precision. 256/52 = 4.92, so only 5x double chunks have more precision (mantissa bits) than your input, and could exactly represent any 256-bit integer. (IEEE double does have a large enough exponent range; -1022 .. +1023). And have enough to spare that log2(int) should map each 256-bit input to a unique monotonic output, even with some rounding error.
QUESTION
My laravel app does not work on xampp or a live server but it works fine on the link provided by PHP artisan serve. Whenever I run this app on xampp it returns 404 error. I have other laravel apps also which work fine on xampp but this one. I am unable to find any solution to it that why my laravel is not running on a hosted server or xampp. I have tried all the solutions found in related questions but did not find any of those useful.
- I have tried running the app after changing my existing .htaccess file in the root folder.
- I have tried running the app after changing .htaccess file in public folder.
- I have tried running the app after deleting both and one of them.
- I have tried installing and updating the dependencies again using composer.
What should I do to make it running?
What I see when I try to run it through xampp is the errors, but the folder structure that always occurs when one runs a web app through it.
Right now, I have a single htaccess file which is in my root folder. Below is the code of it:
...ANSWER
Answered 2021-Jun-04 at 07:52I've ran into this problem too. I've done some research and the only way I found possible to run Laravel on xampp was the following:
- In the parent folder of the laravel setup, I created a folder called "laravel" and moved everything inside of it.
- I went in laravel/public and took every file out of it, and I put it in the parent directory, resulting in the following folder structure: (in my htdocs)
QUESTION
I have a table for messages of my application which contains 2 user ID per each row as below:
tbl_messages:
id message_title owner_user_id recipient_user_id 1 Message 1 2 4 2 Message 2 1 5 3 Message 3 4 9User IDs are foreign keys of this table in my MySQL database. The main table is like this:
tbl_users
id first_name last_name 1 Sarah Pearson 2 John Smith 3 Mery TaylorI know how can I retrieve the first_name and last_name of a person by using a JOIN like this:
ANSWER
Answered 2021-May-22 at 02:08You can use alias to determine which data is from each user. Try:
QUESTION
I've created the reducer and using it to change the state of my store. but as you can see in App.js whenever I click on button and update the state. it updates. I can see it in console. but component does not update. as you can see I have list of tracks there it is not updating. and if I make any changes to code because of that the component re-render I can see the new state after that. why is it not rendering automatically whenever the state updates.
Action
...ANSWER
Answered 2021-Jun-03 at 19:05This is happening because your component does not know that store has been updated, you can use something like this
QUESTION
I'm using map function to set values to the array of objects. but whenever i pass multiple objects it only stores only last one. I can't find why it is doing this.
...ANSWER
Answered 2021-May-31 at 10:26Instead of updating state in map, you need to create new object and then store into state like below:-
QUESTION
ANSWER
Answered 2021-May-25 at 19:26The easiest way is to use pandas directly:
QUESTION
I have an array with 3 objects but I only want the values which are distinct with specific object property artist_name. I tried using map() but wasn't able to achieve what I want. I have the following array.
ANSWER
Answered 2021-May-25 at 17:50Assuming, you have an object with properties, you could filter the entries with a Set and create a new object.
QUESTION
I'm using the Taylors series to calculate the cos of a number, with small numbers the function returns accurate results for example cos(5) gives 0.28366218546322663. But with larger numbers it returns inaccurate results such as cos(1000) gives 1.2194074101485173e+225
ANSWER
Answered 2021-May-24 at 01:07The number returned is simply a number; it has no sense of notation until you print it. If you're looking to control how the value is printed, let's suppose you're printing like so
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