mean | MEAN stack uses Mongo , Express , Angular and Node | Runtime Evironment library

 by   linnovate TypeScript Version: v1.0rc1 License: No License

kandi X-RAY | mean Summary

kandi X-RAY | mean Summary

mean is a TypeScript library typically used in Server, Runtime Evironment, Angular, Nodejs, MongoDB, Express.js applications. mean has no bugs, it has no vulnerabilities and it has medium support. You can download it from GitHub.

The mean stack is intended to provide a simple and fun starting point for cloud native fullstack javascript applications. MEAN is a set of Open Source components that together, provide an end-to-end framework for building dynamic web applications; starting from the top (code running in the browser) to the bottom (database). The stack is made up of:.

            kandi-support Support

              mean has a medium active ecosystem.
              It has 12175 star(s) with 3534 fork(s). There are 619 watchers for this library.
              It had no major release in the last 12 months.
              There are 6 open issues and 1256 have been closed. On average issues are closed in 369 days. There are 43 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of mean is v1.0rc1

            kandi-Quality Quality

              mean has no bugs reported.

            kandi-Security Security

              mean has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              mean does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              mean releases are available to install and integrate.
              Installation instructions are not available. Examples and code snippets are available.

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            mean Key Features

            No Key Features are available at this moment for mean.

            mean Examples and Code Snippets

            Compute the mean of values .
            pythondot img1Lines of Code : 163dot img1License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def mean(values,
              """Computes the (weighted) mean of the given values.
              The `mean` function creates two local variables, `total` and   
            Calculate the mean - per - class accuracy .
            pythondot img2Lines of Code : 102dot img2License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def mean_per_class_accuracy(labels,
            Compute the mean intersection over the predictions .
            pythondot img3Lines of Code : 100dot img3License : Non-SPDX (Apache License 2.0)
            copy iconCopy
            def mean_iou(labels,
              """Calculate per-step mean Intersection-Over-  

            Community Discussions


            How to produce a point graph in R like this?
            Asked 2021-Jun-16 at 04:05

            I have basically this very odd type of data frame:

            The first column is the name of the States (say I have 3 states), the second to the last column (say I have 5 columns) contains some values recorded at different dates (not continuous). I want to create a graph that plots the values for each State on the range of the dates that starts from the earliest and end in the latest dates (continuous).

            The table looks like this:

            state 2020-01-01 2020-01-05 2020-01-06 2020-01-10 AZ NA 0.078 -0.06 NA AK 0.09 NA NA 0.10 MS 0.19 0.21 NA 0.38

            "NA" means there is not data.

            How do I produce this graph in which the x axis is from 2020-01-01 to 2020-01-10 (continuous), the y axis contains the changing values (as points) of the three States, each state occupies its separate (segmented) y-axis?

            Thank you.



            Answered 2021-Jun-16 at 03:41

            You can get the data into a long format, which makes it easier to plot. R will make it difficult to read column names that start with a number. While reading the data, ensure that you have check.names = FALSE so that column names are read as is.



            Python creating a list of lists overrides but does not append
            Asked 2021-Jun-16 at 03:50

            Folks, Basically what I am expecting is a list of lists based on the input comma separated numbers. As you can see I have 5,6 which means I need to create a 5 lists with 6 elements and each of the element in the lists will have to be multiplied by the index position. So what I need from the below input is [[0,0,0,0,0,0], [0,1,2,3,4,5], [0,2,4,6,8,10], [0,3,6,9,12,15],[0,4,8,12,16,20]]

            instead what I get is [[0, 4, 8, 12, 16, 20], [0, 4, 8, 12, 16, 20], [0, 4, 8, 12, 16, 20], [0, 4, 8, 12, 16, 20], [0, 4, 8, 12, 16, 20]]

            not sure what I am doing wrong.. Can anyone please help?



            Answered 2021-Jun-16 at 03:49

            This can easily be done using list comprehension



            Understanding splitting list item to variable python code
            Asked 2021-Jun-16 at 01:27

            I have a python code I know where is it used but want to know its meaning so that I can use it for my bigger python projects This is my python code



            Answered 2021-Jun-16 at 01:27

            I don't know if I understood your question, but this is what the code is doing:

            var_list is a list with two elements [100, 2025].

            slice1 and slice2 are being defined as (var_list + [None]*2)[:2]. This expression adds the var_list to a new list of 2 None objects ([None] * 2 == [None, None]). The result of this expression ((var_list + [None] *2)) is the addition of these 2 lists, which is: [100, 2025, None, None]

            Then the last part ([:2]) is just slicing the first 2 elements of this resulting list and assigning it to the variables. And since, in this case, the first 2 items are the var_list itself, it will assign the first element to slice1 and the second to slice2.



            Parallelization in Durable Function
            Asked 2021-Jun-16 at 01:02

            I'm trying to understand how parallelization works in Durable Function. I have a durable function with the following code:



            Answered 2021-Jun-10 at 08:44

            There are two approaches that are possible. The first is to use a suborchestrator for each job so that each suborchestrator handles just a specific job. Here is the docs for this approach Example from docs seem to be alike to yours.

            The other is to use ContinueWith so that each job has its own "chain"



            How to type-constrain the entries of a Raku function's array argument?
            Asked 2021-Jun-15 at 23:08

            I am trying to define a subroutine in Raku whose argument is, say, an Array of Ints (imposing that as a constraint, i.e. rejecting arguments that are not Arrays of Ints).

            Question: What is the "best" (most idiomatic, or straightforward, or whatever you think 'best' should mean here) way to achieve that?

            Examples run in the Raku REPL follow.

            What I was hoping would work



            Answered 2021-Jun-15 at 06:40

            I think the main misunderstanding is that my Int @a = 1,2,3 and [1,2,3] are somehow equivalent. They are not. The first case defines an array that will only take Int values. The second case defines an array that will take anything, and just happens to have Int values in it.

            I'll try to cover all versions you tried, why they didn't work, and possibly how it would work. I'll be using a bare dd as proof that the body of the function was reached.




            How to multiply every row in dataframe by value from csv file
            Asked 2021-Jun-15 at 21:54

            Here's my csv file CSV

            I'm trying to take the mean of columns "Angle Min" and "Angle Max" and then multiply every row in the resulting dataframe with the "Angle Conversion Factor" in cell D8. Likewise I want to do the same with "Torque Min" and "Torque Max" (get the mean and then multiply the resulting dataframe by the "Torque Conversion Factor" in Cell E8).

            Here's my code so far:



            Answered 2021-Jun-15 at 21:54

            Your AngleConcFactor and TorqueConvFactor remain as 1x1 DataFrames in your code. Just a slight cleanup of your function might give you what you need:



            How do you use two aggregate functions for separate tables in a join?
            Asked 2021-Jun-15 at 21:40

            Sorry if this is a noob question!

            I have two tables - a movie and a comment table.

            I am trying to return output of the movie name and each comment for that movie as long as that movie has more than 1 comment associated to it.

            Here are my tables



            Answered 2021-Jun-15 at 20:19

            Something like this could work



            Blending images without color change?
            Asked 2021-Jun-15 at 21:26

            While studying OpenCV, I realized that whenever I blend two images the colors of scr2 have changed in some way(depends on the colors of scr1).

            I know this is not an informative and clear way to explain my issue, however; I don't know how to describe this issue since I have no expertise with colors so I would like to show you what I meant with images and code.

            The input image: Input image



            Answered 2021-Jun-15 at 16:46

            I think I misunderstood your issue. If your issue is that the image where you do not have lines has changed, then that is because you used a white background for scr2. The white then mixes with your image in the output. Make it scr2=img.copy() in place of what you have now. Then try your code. So in Python/OpenCV as a demonstration, using the Lena image as background, here is your code:



            Allocating memory with calloc for an int pointer
            Asked 2021-Jun-15 at 21:19

            Hey guys given the example below in C when operating on a 64bit system as i understand, a pointer is 8 byte. Wouldn't the calloc here allocate too little memory as it takes the sizeof(int) which is 4 bytes? Thing is, this still works. Does it overwrite the memory? Would love some clarity on this.

            Bonus question: if i remove the type casting (int*) i sometimes get a warning "invalid conversion from 'void*' to 'int*', does this mean it still works considering the warning?



            Answered 2021-Jun-15 at 21:19

            calloc is allocating the amount of memory you asked for on the heap. The pointer is allocated by your compiler either in registers or on the stack. In this case, calloc is actually allocating enough memory for 4 ints on the heap (which on most systems is going to be 16 bytes, but for the arduino uno it would be 8 because the sizeof(int) is 2), then storing the pointer to that allocated memory in your register/stack location.

            For the bonus question: Arduino uses C++ instead of C, and that means that it uses C++'s stronger type system. void * and int * are different types, so it's complaining. You should cast the return value of malloc when using C++.



            Using std::atomic with futex system call
            Asked 2021-Jun-15 at 20:48

            In C++20, we got the capability to sleep on atomic variables, waiting for their value to change. We do so by using the std::atomic::wait method.

            Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.

            Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.

            Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*

            On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says

            The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.

            Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.

            Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.

            So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?

            (Solutions like mixing atomics and condition variables exist, but sub-optimal)



            Answered 2021-Jun-15 at 20:48

            You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.

            Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.

            For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.

            ... and casting std::atomic to u/int* is UB

            This isn't actually the case.

            std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).

            As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


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            Install mean

            You can download it from GitHub.


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