如何在VB.NET中的维数组[4x2]中使用绝对值（abs） [英] How do I use the absolute value (abs) in a dimension array [4x2] in VB.NET

问题描述

大家好，

之前我有一个问题以及如何在数组中使用它。



一切都还好，现在我想在维数组中制作abs（我知道我已经打开过关于维数组的先前问题，但是......） />


所以，我想进行abs计算并将其存储到新的[4x2]数组中。我做错了什么？



谢谢



我尝试了什么：

Hello to all,
Previously I had a question about abs math function and how can I use it in an array.

Everything is ok ,now I want to make abs in an dimension array (I know I had opened the previously question about dimension array, but ...)

So, I want to make the abs calculation and store it to a new [4x2] array. What am I doing wrong?

Thank you

What I have tried:

Dim spalings As Double(,) = {{-1, 2.0}, {-3, 4}, {-5, 6}, {-0.7, 8}}
Dim spalins2 As Double(,) = New Double((spalings.Length - 1), (spalings.Length - 1)) {}
    For x As Integer = 0 To spalings.Length - 1
         For j As Integer = 0 To spalings.Length - 1
              spalins2(x, j) = Math.Abs(spalings(x, j))
         Next j
    Next x

推荐答案

嗯...你知道什么长度返回多维数组，是吗？

每次调用它都会返回相同的值吗？

Um...you do know what Length returns for a multidimension array, yes?
And that it will return the same value each time you call it?

Dim spalins2 As Double(,) = New Double((spalings.Length - 1), (spalings.Length - 1)) {}

和

And

For x As Integer = 0 To spalings.Length - 1
     For j As Integer = 0 To spalings.Length - 1

那么你认为它有多少元素调查？

答案是：它返回元素总数 - 在你的情况下为8。

所以你的循环将执行8 * 8次，并尝试看看64个元素。所以你的程序会崩溃。

你需要查看GetUpperBound方法： Array.GetUpperBound方法（Int32）（系统） [ ^ ]

So how many elements do you think it's going to investigate?
The answer is: it returns the total number of elements - in your case "8".
So your loop will execute 8 * 8 times, and try to look at 64 elements. So your program will crash.
You need to look at the GetUpperBound method: Array.GetUpperBound Method (Int32) (System)[^]

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