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2D Array

chris rous
Greenhorn

Joined: May 16, 2012
Posts: 21

I am trying to make this code output the array, make it show min, max, and average for each of the array groups at the bottom of the listed array's and make it put 1 * per 10 behind eacht number (ie 25=**)

Right now it gives out all the arrays by day, and at the bottom it shows "average". The average doesn't work right thoughm I get
"Das durchschnitts Wert für tag 1 beträgt: 6.5
Das durchschnitts Wert für tag 2 beträgt: 9.0
Das durchschnitts Wert für tag 3 beträgt: 10.0
Das durchschnitts Wert für tag 4 beträgt: 0.0" the number at the end is the average.

Could you guys give me some help with that?

Would also be nice if you could give me tips on how to do min/max and the stars =D


dennis deems
Ranch Hand

Joined: Mar 12, 2011
Posts: 808
Check carefully the place in your code where you update the total. Are you actually adding together all the values in the array? Or is something else happening?
fred rosenberger
lowercase baba
Bartender

Joined: Oct 02, 2003
Posts: 11308
    
  16

I would say you have several things here:
1) output the array
2) find the min
3) print the min
4) find the max
5) print the max
6) find the average
7) print the average
8) calculate the number of stars for a given number
9) print some number of stars.

Each and every one of these is independent of the others...Printing the min has no connection at all to how i find the min. Calculating a number of stars has nothing to do with printing some number of stars.

So...pick one of the above, and get it to work. Once you've done that, pick the next, and get it to work. Then, if it makes sense, connect them. it is possible your method to print the min may call the method that finds the min, for example.


There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38780
    
  23
Fred, you are slipping. You are supposed to say, “if Campbell were here he would tell you there is no such thing as a 2D array.”

Which is true. That is not a 2D array, but an array of arrays. Which is better; you can change the length of one array (by re‑assigning it) without changing the other elements.
Winston Gutkowski
Bartender

Joined: Mar 17, 2011
Posts: 7779
    
  21

Campbell Ritchie wrote:Fred, you are slipping. You are supposed to say, “if Campbell were here he would tell you there is no such thing as a 2D array.”

Well I'll say it instead: What an almighty surprise to find a thread entitled '2D array' with your name on it as last replier. Posted at 7:41 BST too I notice, so I presume you got up specially to do it.

chris rous wrote:I am trying to make this code output the array, make it show min, max, and average for each of the array groups at the bottom of the listed array's and make it put 1 * per 10 behind eacht number (ie 25=**)

Well, min, max and average sound very much like functions to me, so I'd look at making them methods. If I was writing them, I'd also want to make them as loosely coupled as possible, so that I could use them in other programs/classes if I wanted.

I won't help you with how to write them, but this what their signatures should probably look like:
  • public static final double average(double[] values) { ...
  • public static final int max(double[] values) { ...
  • (I'll leave min() - or minimum() - up to you).

    As for the 4th requirement, you'll have to explain what you mean by "behind each number". Do you mean the results or the values in the arrays? Perhaps if you show us an example it would be clearer.

    Winston


    Isn't it funny how there's always time and money enough to do it WRONG?
    Articles by Winston can be found here
    Campbell Ritchie
    Sheriff

    Joined: Oct 13, 2005
    Posts: 38780
        
      23
    7.41 isn’t that early. At least not on a Thursday.
    chris rous
    Greenhorn

    Joined: May 16, 2012
    Posts: 21

    Dennis Deems wrote:Check carefully the place in your code where you update the total. Are you actually adding together all the values in the array? Or is something else happening?


    I just noticed that for the Average all it does is take the first number form each array and divide it by 4.

    Thanks for all the reply's guys, I'll say if they helped or not once I've tried them out.
    chris rous
    Greenhorn

    Joined: May 16, 2012
    Posts: 21

    I added an attachment here to show you what the program is supose to do.

    messwerte fuer tag *= measured data for day *
    messwert= measured data
    auswertung fuer tag * = analysis for day*
    durchschnitt = average
    laenge= length

    Right now it looks like (the "messwerte" from the picture aren't the ones I'm useing for my program):

    messwerte für tag: 1
    wert: 25.0
    wert: 26.0
    wert: 29.0
    wert: 35.0
    wert: 45.0
    wert: 55.0
    wert: 97.0
    wert: 110.0
    wert: 150.0
    wert: 160.0
    wert: 180.0
    wert: 201.0
    wert: 222.0
    wert: 200.0
    wert: 190.0
    wert: 189.0
    wert: 180.0
    wert: 154.0
    wert: 120.0
    wert: 92.0
    wert: 80.0
    wert: 44.0
    wert: 33.0
    messwerte für tag: 2
    wert: 35.0
    wert: 36.0
    wert: 38.0
    wert: 39.0
    wert: 35.0
    wert: 55.0
    wert: 65.0
    wert: 107.0
    wert: 120.0
    wert: 160.0
    wert: 177.0
    wert: 192.0
    wert: 224.0
    wert: 234.0
    wert: 220.0
    wert: 199.0
    wert: 179.0
    wert: 177.0
    wert: 144.0
    wert: 120.0
    wert: 90.0
    wert: 77.0
    wert: 45.0
    wert: 30.0
    messwerte für tag: 3
    wert: 7.0
    wert: 40.0
    wert: 42.0
    wert: 45.0
    wert: 51.0
    wert: 59.0
    wert: 67.0
    wert: 110.0
    wert: 0.0
    wert: 150.0
    wert: 190.0
    wert: 209.0
    wert: 232.0
    wert: 245.0
    wert: 250.0
    wert: 249.0
    wert: 240.0
    wert: 230.0
    wert: 208.0
    wert: 180.0
    wert: 160.0
    wert: 110.0
    wert: 89.0
    wert: 70.0
    messwerte für tag: 4
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    wert: 0.0
    Das durchschnitts Wert für tag 1 beträgt: 6.5
    Das durchschnitts Wert für tag 2 beträgt: 9.0
    Das durchschnitts Wert für tag 3 beträgt: 10.0
    Das durchschnitts Wert für tag 4 beträgt: 0.0


    [1345750110967.jpg]

    fred rosenberger
    lowercase baba
    Bartender

    Joined: Oct 02, 2003
    Posts: 11308
        
      16

    I think we understand what the program is supposed to do.

    What we don't understand is what - specifically - you need help with. Have you tried any of the suggestions given? If so, what happened? What does your code look like now? Where are you confused or stuck?

    If you are looking for someone to hand you the complete solution, you are in the wrong spot. If you want all the help in the world figuring out how to do it yourself, you need to let us know exactly where you need that help.
     
    It is sorta covered in the JavaRanch Style Guide.
     
    subject: 2D Array