Question

I have a problem with arrays in java.
I have a array:

double[][] tab2 = {{318, 0.0825},
                  {321, 0.1131},
                  {309, 0.0283},
                  {319, 0.0830}};

and I need to change that array to:

double[][] tab2 = {{318, 0.0830},
                  {321, 0.0283},
                  {309, 0.1131},
                  {319, 0.0825}};

This is what i mean. I have four numbers. In this example 318, 321, 309 and 319. Every number is connected with another number, like 318 – 0.0825, 321 – 0.1131, etc. I need change value second values. When number which is connected with the biggest number should be connected with the smaller eg. 321 – 0.1131 should be 321 – 0.0283, 318 – 0.00830 should be 318 – 0.0825. It is possible to do this things?

Answer 1

It would be easier to do this if the arrays were arranged in transposed form.

double[][] tab3 = {
    {318.0, 321.0, 309.0, 319.0},
    {0.0830, 0.1131, 0.0283, 0.0830}}

You can then sort the first array (tab3[0]) in ascending order and then the second array (tab3[1]) in descending order. Then all of the array indexes will line up and match the largest to the smallest. double[0][0] will be the biggest and double[1][0] will be the smallest, matching 309 and 0.1131 together.

double[][] tab3 = {
    {309.0, 318.0, 319.0, 321.0},
    {0.1131, 0.0830, 0.0830, 0.0283}}