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Editorial Team
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Asked: 2026-05-14T20:43:31+00:00

Trying to do some really basic math here, but my lack of understanding of

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Trying to do some really basic math here, but my lack of understanding of Java is causing some problems for me. 


double[][] handProbability = new double[][] {{0,0,0},{0,0,0},{0,0,0}};
double[] handProbabilityTotal = new double[] {0,0,0};
double positivePot = 0;
double negativePot = 0;
int localAhead = 0;
int localTied = 1;
int localBehind = 2;
//do some stuff that adds values to handProbability and handProbabilityTotal



positivePot = 
   (handProbability[localBehind][localAhead] + 
   (handProbability[localBehind][localTied] / 2.0) + 
   (handProbability[localTied][localAhead] / 2.0) ) / 
   (handProbabilityTotal[localBehind] + (handProbability[localTied] / 2.0));



negativePot = 
    (handProbability[localAhead][localBehind] + 
       (handProbability[localAhead][localTied] / 2.0) + 
          (handProbability[localTied][localBehind] / 2.0) ) / 
    (handProbabilityTotal[localAhead] + (handProbabilityTotal[localTied] / 2.0));

The last two lines are giving me problems (sorry for their lengthiness).
Compiler Errors:


src/MyPokerClient/MyPokerClient.java:180: operator / cannot be applied to double[],double
            positivePot = ( handProbability[localBehind][localAhead] + (handProbability[localBehind][localTied] / 2.0) + (handProbability[localTied][localAhead] / 2.0) ) / (handProbabilityTotal[localBehind] + (handProbability[localTied] / 2.0) );
                                                                                                                                                                                                                                             ^
src/MyPokerClient/MyPokerClient.java:180: operator + cannot be applied to double,
            positivePot = ( handProbability[localBehind][localAhead] + (handProbability[localBehind][localTied] / 2.0) + (handProbability[localTied][localAhead] / 2.0) ) / (handProbabilityTotal[localBehind] + (handProbability[localTied] / 2.0) );
                                                                                                                                                                                                 ^
src/MyPokerClient/MyPokerClient.java:180: operator / cannot be applied to double,
            positivePot = ( handProbability[localBehind][localAhead] + (handProbability[localBehind][localTied] / 2.0) + (handProbability[localTied][localAhead] / 2.0) ) / (handProbabilityTotal[localBehind] + (handProbability[localTied] / 2.0) );

Not really sure what the problem is. You shouldn't need anything special for basic math, right?

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1 Answer

  1. Editorial Team

    The line before last line has the issue.

    positivePot = 
   (handProbability[localBehind][localAhead] + 
   (handProbability[localBehind][localTied] / 2.0) + 
   (handProbability[localTied][localAhead] / 2.0) ) / 
   (handProbabilityTotal[localBehind] + (handProbability[localTied] / 2.0));

    handProbability is a two dimensional double array. So handProbability[localTied] is an array of doubles. it is not a double value. Based on your last line, I think it should be handProbabilityTotal[localTied].

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