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  1. #1
    dredd is offline Member
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    Default How can i generate random indices of a matrix cell?

    I defined the matrix of int's to be 10 by 10 and i want random position of a cell to be picked starting from index row=5 and cell=0 to row=10 and cell=10 and i want to pick 7 times a cell(a different cell each time) and put in the cell the value of 1(other cells will be zeros).

    How can it be done?

  2. #2
    sehudson's Avatar
    sehudson is offline Senior Member
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    Default Re: How can i generate random indices of a matrix cell?

    I think it would be easier if you define a "row range" and a "cell range", and that would define a "block" of cells that fall within that given zone.

    Then, you could generate 2 random numbers, R and C, that are locked into the "row range" and "cell range", respectively.

  3. #3
    JosAH's Avatar
    JosAH is offline Moderator
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    Default Re: How can i generate random indices of a matrix cell?

    Define a class Point (x,y) or use an existing class and stick all points that can possibly be selected in a Collection like a List, call Collections.shuffle(yourCollection) and finally use the first seven Points from your Collection. Alternatively select a random point and check if it is already selected before, if not, definitely select it and stick the Point in the 'taboo' List or Set or whatever.

    kind regards,

    Build a wall around Donald Trump; I'll pay for it.

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