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Questions tagged [cartesian]

Don't use this tag. If you have questions about cartesian products (e.g. SQL, Spark, Datatables, heterogeneous tuples), use `cartesian-product` tag. If you have questions about planar geometry / 3D-graphics, use `cartesian-coordinates` tag.

245 questions
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Sum two columns from two tables without cartesian

I searched for a while but nothing I find fixes my problem... I have two tables: earnings, expenses I have the columns: earnings.amount earnings.date expenses.amount expenses.date I want to sum the amount of all my earnings and show them by year…
Haddock-san
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Maple: How to convert Cylindrical coordinates to Cartesian coordinates?

We get some expression in Cylindrical coordinates (r, ϕ, z ) like : expr := r*z^2*sin((1/3)*ϕ) we need to convert it into Cartesian coordinates and than back to Cylindrical coordinates. How to do such thing? So I found something like…
Rella
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Is there a Python module or built-in function that will help me write this program?

I'm working on an exercise at the Exercism website, and I'm a little stuck on how to begin this one. I don't want any detailed answers; I'm just looking for a push in the right direction for how to begin. When given a set of (x, y) coordinates, I'd…
John Salerno
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Remove rows with same order in a column value obtained from Cartesian product / Cross join.If a row value is AB and other value is BA. I need only AB

how to remove rows with same order in a column value obtained from Cartesian product / Cross join. For e.g., if a row with column value is AB and other row is BA. I need to have only 1 row AB.? Please note that I am doing this for a huge dataset…
shravan
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Code for converting Cartesian (x,y,z) to Cylindrical (ρ,θ,z) coordinates 2D/3D

Is there any code in C++ to converts from Cartesian (x,y,z) to Cylindrical (ρ,θ,z) coordinates in 2-dimensions and 3-dimensions!! Thanks
MAY
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Generating cartesian product java

I'm trying to load test a backend server and I'm parsing some config into a Label object. I'm trying to generate Cartesian product of Label objects which would be a Metric object. Label { String name; String labe; } I have a List>…
Shrenik Gala
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Cartesian product for number of sets using Excel VBA

Is there a way to create a macro in excel to generate all possible combinations (Cartesian product) of a number of sets (more than 8), each containing a dynamic number of words (up to 60 words). eg. if I have 4 sets as below: Set 1: A1 …
MZee
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Convert Polar Image to a Cartesian Image

I am attempting to convert an image in polar coordinates (axes are angle x radius) to an image in cartesian coordinates (axes are x and y). This is simple enough in matlab using pcolor() but the issue is that I must do this in a mex file (c++…
Dan Snyder
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Comparing opencv lineartoPolar() transformation in python

My objective is to convert a 2D power spectrum (below) from cartesian to polar coordinates. imshow(np.log10(psd2shift),cmap=cm.jet) There are several posts on stackoverflow on how to do just that such as this link. And so I believe my code is…
icypy
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How to display 4 quadrants on Cartesian graph? mathematica

How can I get Mathematica to display all 4 quadrants, not just the area where my data exists. I'm building an application to illustrate how matrix transformations affect a graphed shape and I want all 4 quadrants displayed for every step. I tried…
Monica Harrison
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Cartesian Product of two lists in F# using recursion and helper function

I am trying to get the cartesian product of two lists and I am getting an error that says that my function productHelp is not defined. I am not too sure how to solve this without having a helper function and I am not even sure if this would even…
Shinji-san
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Create interactive cartesian grid in django

I have a question regarding a platform I'm developing called e-cidadania (GPL). One of the applications will be something like a blackboard where you can put messages. I've been requested to do it like a cartesian grid (p.e. x = good/bad, y =…
CastleDweller
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Getting a Cartesian Similar result from the list in JAVA

I have A List of Map of List for Eg. as Below List> pageData = new ArrayList<>(); List>> curPage = new ArrayList<>(); Map curpage1=new HashMap<>(); List curpage1list = new ArrayList(); …
Garry Steve
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Get combinations with condition Scala|Spark

I have an RDD tagIDs with the following content: (name_1, Set_1), ... (name_t, Set_t), ... I want to create pairs of pairs (name_i, Set_i), (name_j, Set_j), but only if Set_i.intersect(Set_j).size > 0 The only way I managed to do that is: …
elfinorr
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How to expand across cartesion product of columns in Spark DataFrame like in pandas?

For example, one dumb way of doing this in pandas is like d = df.set_index(['date', 'a']).unstack('a').stack('a', drop_na=False) d.shape, df.shape (10, 4), (30, 4) if you had 3 unique dates across 10 unique values of 'a' (expands to 10 x…
mathtick
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