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I am very new to java and I have this assignment which I have been working on very intensivly for the last 14 days.

The assignement is to build a class vector with max. 7 dimensions: what I came with to make the vector multi-dimensional is that I declared 7 variables

private double x, y,z,i,j,k,f;

which then I will initialize in constructors etc.. Well, my first question: did I build a 7 dimensional vector in this way?

OR,

should I somehow work with arrays for this problem like declaring an array; 

double [][] = data; // which generates a 2D-Vector.

AND,

double [][][][][][][] = data1; //which declare a 7D-Vector??!!!

for any helpful information I will be very thankful

thanks all and Best regards to you :)

azurefrog
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Rick_C132
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  • Check the answer on this question: [HERE](https://stackoverflow.com/a/7913679/4250184) – Bobzone Nov 14 '17 at 21:54
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    Define "vector" - do you mean it in the sense of a mathematical ordered tuple like (1,2,3)? Or in the sense of eg. c++ and Java `Vector` class which stores a list of values? – hnefatl Nov 14 '17 at 21:55
  • 1. No. 2. Maybe ... depending on what `data` is. – Stephen C Nov 14 '17 at 22:39

2 Answers2

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did I build a 7 dimensional vector in this way?

Yes you have. A vector is a way of storing a magnitude and direction, which is done by correctly assigning the value and sign of each double. A vector in 2-space would require two values, and a vector in 7-space would require 7 values, which you have.

should I somehow work with arrays for this problem like declaring an array;

You can, but you don't need a multi-dimensional array. To store a single vector in a 7-space, you just need an array of length 7:

double[] data = new double[7]; // store a 7D vector

You could then modify your existing code, replacing x with data[0], y with data[1] and so on.

azurefrog
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0

You don't need a multidimensional array for a vector. By definition, a vector has only a single column; if it had multiple columns, it would be a matrix, not a vector.

If you want a vector of size n, just create a single-dimensional array of size n. You could use an ArrayList or something like that, but there's less of a point because you (presumably) know the size of the vector in advance. (If that's not the case, ArrayList could be good).

The most interesting part of a Vector class is actually the operations, so use whatever data structure allows you to retain order and conveniently perform your operations. Truthfully, that'll probably be an array of size n.

EJoshuaS - Stand with Ukraine
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