xPress | xPress File archiver and extractor | Compression library
kandi X-RAY | xPress Summary
kandi X-RAY | xPress Summary
xPress is a file compressor/archiver that stores data using a new type of compression algorithm called xPress. The xPress algorighm is very similar to LZW, but currently not as efficient. Currently xPress.py only supports files (not folders). File path arguments require absolute paths.
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Top functions reviewed by kandi - BETA
- Parse command line arguments
- Write a log entry to a log file
- Prints an error gracefully
- Builds a dictionary
- Compress data
- Defines the offset of the file
- Defines the chunk size of the input file
- Prints a message gracefully
- Extract a dictionary from a file
- Decompress a file
- Loop over the input dictionary
- Compress a dictionary
- Define the dictionary length
- Print the welcome message
xPress Key Features
xPress Examples and Code Snippets
Community Discussions
Trending Discussions on xPress
QUESTION
When running this code
...ANSWER
Answered 2021-Feb-09 at 05:44The dtype of the np arrays must be explicitly set to xp.npvar. This is stated here:
The NumPy arrays must have the attribute dtype equal to xpress.npvar (abbreviated to xp.npvar here) in order to use the matricial/vectorial form of the comparison (<=, =, >=), arithmetic (+, -, *, /, **), and logic (&, |) operators.
If you don't set the type to npvar, the wrong overloads for these operators will be used and z <= 1 - t will just be an array of booleans.
This is the correct way to create your arrays:
QUESTION
I created package.json file using (npm init) in cmd in project folder ,then i wrote (npm i parcel --save-dev) and this what i got :
...ANSWER
Answered 2021-Jan-25 at 19:22Just remove extra trailing comma at this line:
QUESTION
I have been facing this problem with git in which I am trying to upload .mp4 files in a subdirectory of wwwroot/ but whenever I am writing git status, they won't appear.
The new video files are located inside wwwroot/Content/Videos/ZoomEspecialista/
This problem has never occured before. I have uploaded maybe 10-15 new .mp4 files.
Regardless of that, in my .gitignore file, I am not excluding the folder which contains these .mp4 files. I have checked multiple times to see if there is something, but I think the problem lies somewhere else. If anyone has any idea on how to tackle this issue, it would be superbly appreciating. Thanks!
The only thing I get from doing a git status is this despite of having uploaded my files to that subdirectory:
EDIT 2: Here is my .gitignore file:
...ANSWER
Answered 2021-Jan-09 at 22:12I'm not sure how big your files are but git normally is not meant to work with very large files. I would suggest enabling lfs for .mp4 files
QUESTION
I'm trying to solve a SOCP problem using cvxpy and integrating it to cvxpylayers. I'm looking at this SOCP problem (problem 11) (here is the scihub link in case you can't access), and here is a snippet of the problem (note min (p-t) comes from an adaptation of problem 4 using expression 8 in the link above):
Go to ---> EDIT 2
OLD
I've looked at this example, but is still stuck and can't get the problem to be solved. Here is a sample code at my attempt:
...ANSWER
Answered 2020-Dec-11 at 12:20You should change
x.T @ Q @ x <= N * p**2
to
(x.T @ Q @ x)/p <= N * p
assuming p>=0.
Btw if you want to know more about how to formulate this as a SOCP, then consult the Mosek modelling cookbok.
QUESTION
So i wrote a code to calculate the multiplication of two matrixes. The programm is doing its job by producing the correct outcome. I provide most of the output fuction below:
...ANSWER
Answered 2020-Oct-30 at 19:02To end without newline, stop printing newline at the end.
QUESTION
I am an absolute beginner at Xpress Mosel and Linear Programming in general so please forgive me if I made any obvious mistakes. That being said, I am currently in the process of making up a problem and implementing it in Xpress Workbench.
The problem:
Let's say there's a scenario where a small chess manufacturer makes chess sets A and B. Chess Set A is priced at $30 while Chess Set B is priced at $40. The chess set manufacturer has received orders from 10 retailers who want to buy both chess sets, with each retailer incurring different amounts of shipping costs for each chess set sold. If the chess set manufacturer can only sell a minimum of 100 chess sets and a maximum of 300 chess sets to each retailer , how many of each chess set should the chess manufacturer sell to each retailer to maximize profits?
If I'm not mistaken, the objective function would be:
Profit = (30 * x1 - s * x1) + (40 * x2 - s * x2)
where x1 is the number of Chess Sets A, X2 is the number of Chess Sets B and s is shipping costs.
Constraints are:
x1, x2 <= 300
x1, x2 >= 100
x1, x2 >= 0
The shipping costs for each retailer is:
My attempt at implementing this problem in Mosel is shown in the following code.
...ANSWER
Answered 2020-Oct-26 at 11:13There are two issues with your model:
First, you don't initialize PROFITOFCHESSA or PROFITOFCHESSB. So they will both be 0, i.e., no profit is gained from producing any models. Even worse, for each model produced you have to pay the shipping cost. Since the goal is to maximize the profit, the solver will choose to produce as few models as possible. The minimum number of models to produce is 100 for each retailer (as by your constraint). So the solver goes with this minimal amount for each retailer.
The second problem is that your model is a bit too simplistic: For each piece you produce, you get some profit and pay some shipping cost. If the profit is bigger than the shipping cost then the best solution is to produce as many items as possible (in your case 300 per retailer). If the profit is smaller than the shipping cost then the best solution is to produce as few items as possible (in your 100 per retailer). So there is not much to optimize here.
QUESTION
in my problem, I want to minimize the sum of the square of a decision variable * LARGE_CONSTANT. The reason for square is to incentivize the solver to spread the decision variable around equally; if I have to use the panic variables, I want to use them equally across the set of locations.
Some code (admittedly not enough to reproduce), follows:
...ANSWER
Answered 2020-Aug-19 at 08:35The code snippet does not show which solver module has been loaded: if it employs the Xpress Optimizer module, that is, starts with a line like
QUESTION
So.. I've been tasked with converting a bunch of *.doc files to *.pdf utilizing lowriter
What I would like to do is do this in place, but since there is no option to do that using lowriter, I figured I would capture the originating file and path, capture the conversion, and then move the converted file to the originating path, and then delete the original *.doc
The problem is my sed and or awk is weak at best ;) so I cannot figure out how I can "capture" the converted file name from the output.
My Code:
#!/bin/bash
...ANSWER
Answered 2020-Aug-05 at 14:06#!/bin/bash
FILES=/my/specific/input/folder/**/*.doc
shopt -s globstar
for f in $FILES; do
the_file=$f;
the_orig_dir=$(dirname "$the_file") ;
converted=$(lowriter --headless --convert-to pdf "$the_file");
new_file=$(echo "$converted" | grep -o -P '(?<= -> ).*(?= using filter : )');
new_file_name=$(basename "$new_file");
echo "$the_orig_dir/$new_file_name";
set -x;
rm -f $the_file;
mv "$new_file" "$the_orig_dir/";
set +x;
done;
QUESTION
I've deployed my app on Heroku and after some tweaking, everything works except when I try to retrieve data from the Mongo database. The console error I get is: Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0.
I have the feeling that it won't go into the get request while that should be the case. (Because it's not logging anything in the console)
Am I missing something in the way routes are handled in production? Everything in development is working.
I'm very confused at this point, hope someone can help me
Server.js:
...ANSWER
Answered 2020-Jun-03 at 14:20The error you posted is often seen when parsing JSON fails. I guess this happens when fetch fails to parse the result in the frontend at this line: return response.json().then(jsonResponse => {.
Instead of returning valid JSON, the backend returns a file that starts with "<" (the unexpected token). Your backend responds with an HTML page instead of JSON.
Issue comes from here most likely:
QUESTION
I am working on a blogging application (click the link to see the GitHub repo) with Express, EJS and MongoDB.
I have made a simple pager for the posts.
In the posts controller I have:
...ANSWER
Answered 2020-May-10 at 22:07As a comment correctly points out, this seems to be an issue of scoping.
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Install xPress
You can use xPress like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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