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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,

    The only person who got everything done by Friday was Robinson Crusoe.

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