The following code runs once through the loop fine, but on the second pass, theEquation has had its data changed even though nothing had referenced it.
String[] theEquation = breakdown(theequation);
double[] yValues = new double[400];
for(int i=0; i < bitmapx; i++){
Double v = xmin + (xstep * i);
yValues[i] = Double.parseDouble( solveArrayX( theEquation , v ) );
}
For example, the first time through the for loop, theEquation will have { "x", "^", "2" }. The next time will be { previousCalculatedAnswer, null, null }
Why is theEquation being changed? No other code is referencing it.
Why is theEquation being changed?
theEquation does not contain an array, it contains a reference to an array.
When you do solveArrayX( theEquation , v ) you're passing this reference to the solveArrayX method which changes the array. See lines 120 and 121:
public String solveArrayX(String[] tA, double d){
...
tA[i] = tA[i+2];
tA[i+2] = "";
...
}
If you want to avoid this, you can use Arrays.copyOf(theEquation, theEquation.length) as argument to the method.
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