Changing a value in one part of an array changes in another part

Question

I have a double bracket, public array that when the value of [0][6] of the bracket gets changed to "1", the [1][6] value immediately gets changed to "1" as well and I have no idea why. Here is the code.

This is the array being created in the constructor of my "engine" script.

 public float[][] Frogs;

This is the code when the array is being created and have values added to the brackets.

 Frogs = new float[2][];
 float[] frogInfo = new float[10];
 frogInfo[0] = 0;
 frogInfo[1] = 0;
 frogInfo[2] = 0;
 frogInfo[3] = 0;
 frogInfo[4] = 0;
 frogInfo[5] = 0;
 frogInfo[6] = 0;
 frogInfo[7] = 0;
 frogInfo[8] = 0;
 frogInfo[9] = 0;
 Frogs[0] = frogInfo;
 Frogs[1] = frogInfo;

Then, from a completely different script, I try to change the value of[0][6] to 1, but as soon as I try, the value of [1][6] changes as well. I even checked it in the log and it changes with it.

Debug.Log(froggyengine.Frogs[1][6]); froggyengine.Frogs[0][6] = 1; Debug.Log(froggyengine.Frogs[1][6]);

Can anyone answer why?

Answer 1

Answer by lcplrice · Dec 16, 2020 at 05:21 AM

@DesignerMaverick I believe since you are using the same array instance in memory both are being referenced at the same time. Try to copy the array to make a new instance like so:

 float[] frogInfo2 = frogInfo.Clone() as float[]; 
 
 Frogs[0] = frogInfo;
 Frogs[1] = frogInfo2;

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Changing a value in one part of an array changes in another part

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