I have a vector nested inside another. I want to use modify
to update this matrix in place. So I use it for the inner vector, but do I also need to use it for the outer?
Data.Vector.modify with nested vectors
486 Views Asked by Lo HaBuyshan At
1
There are 1 best solutions below
Related Questions in HASKELL
- Can MVC.NET prevent SQL-injection at razor or controller level?
- Getting and passing MVC Model data to AngularJS controller
- Access property of an object of type [Model] in JQuery
- Entity Framework Code First with Fluent API Concurrency `DbUpdateConcurrencyException` Not Raising
- Bundling and minification issue in MVC
- ASP-MVC Code-first migrations checkbox not active
- Why does Azure CloudConfigurationManager.GetSetting return null
- Dynamic roles list in CustomAuthorize ASP MVC
- Jquery: Change contents of <select> tag dynamically
- Why web API return 404 when deploy to IIS
Related Questions in HASKELL-VECTOR
- Can MVC.NET prevent SQL-injection at razor or controller level?
- Getting and passing MVC Model data to AngularJS controller
- Access property of an object of type [Model] in JQuery
- Entity Framework Code First with Fluent API Concurrency `DbUpdateConcurrencyException` Not Raising
- Bundling and minification issue in MVC
- ASP-MVC Code-first migrations checkbox not active
- Why does Azure CloudConfigurationManager.GetSetting return null
- Dynamic roles list in CustomAuthorize ASP MVC
- Jquery: Change contents of <select> tag dynamically
- Why web API return 404 when deploy to IIS
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular # Hahtags
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
My suggestion from the comments still stands, if you do not need to operate on a ragged array then the usual rectangular array implementation is better. Here is a short list of drawbacks of vector of vectors:
Nevertheless question still stands: how would you modify a vector of vectors in place. Below I'll provide an example function, which uses mutation to reverse rows of a ragged array and another function that reverses both rows and columns. Difference is that in the former we only mutate elements of each row, while in the latter we also mutate the outer boxed vector that corresponds to rows themselves:
Which can be used as follows:
Alternatively we could have used
Data.Vector.modify
to operate on the outer vector or map a destructive action that usesmodify
across all rows. There are all sorts of ways to go about it, depends on what you are trying to achieve, for example:I did recommend using
massiv
for regular multidimensional arrays. Therefore here is also an example of how to achieve the same withwithMArrayST
:Which can be used as follows: