在VB.net中计算三角函数正弦值的问题 [英] Problem in caculating Trigonometric Sine values in VB.net

问题描述

如何计算vb.net中的正弦值???

值应介于-1和1之间。

我将代码编写如下vb.net

How to calculate the sine values in vb.net???
The values should be lie between -1 and 1.
I write the code as follows in vb.net

Label1.Text= Math.Sin(Math.PI)

点击按钮，结果显示在Label1上：1.2246063638223



问题是值应该介于-1和1之间。但是在vb.net中，值大于1，如上所述。当我在Matlab中检查相同的正弦值时：

On button click, the result is shown on Label1 is : 1.2246063638223

The problem is that the values should lie between -1 and 1. But in vb.net, values are greater than 1 like above. When I check the same above sine value in Matlab:

sin(pi) 

结果是：1.2246e-016



介于-1和1之间



当我在计算器上检查相同时。再次，值介于-1和1之间，然后如何在vb.net中解决我的问题。

The result is: 1.2246e-016

Which is between -1 and 1

When i check the same on calculator. again the value is between -1 and 1, then how to resolve my problem in vb.net.

推荐答案

你实际看到的答案是1.22460635382238 E-16



您可能会发现您的标签不够宽并且AutoSize = False

但是，.Net Math.Sin期望角度是弧度，tyour Math.PI代表什么？

转换是[角度度] *（Math.PI / 180）=弧度。



Mike

The answer you''re actually seeing is 1.22460635382238 E-16

You might find your label is not wide enough and has AutoSize = False
However, .Net Math.Sin expects the angle to be in radians, what does tyour Math.PI represent?
The conversion is [angle in degrees] * (Math.PI / 180) = radians.

Mike

解决方案1和2是正确的。在大多数情况下，您不需要以默认格式输出值。



首先，为字符串属性分配一个double值。这样的赋值在.NET中没有任何意义，但是VB.NET通过赋予非double值来提供自动解决方法，但是 double.ToString（），这实际上是一个坏事;如果发出编译错误会更好，因为它通常已经完成。



你应该总是使用 ToString ，它还允许您在此函数的其他形式中提供两者的文化，格式字符串。请参阅： http://msdn.microsoft.com/en-us/library/system .double.tostring.aspx [ ^ ]。



对于格式字符串及其效果，请参阅：

http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx [ ^ ]，

http://msdn.microsoft.com/en-us/library/0c899ak8.aspx [ ^ ]。

-SA

The Solution 1 and 2 are correct. In most cases, you don''t need to output value in its default format.

First of all, you assign a double value to a string property. Such assignment makes no sense in .NET, but VB.NET provides "automatic" work-around by assigning not double value, but double.ToString(), which is actually a bad thing; it would be much better it if issued a compilation error instead, as it is normally done.

You should always use ToString, which also allows you, in other forms of this function, to provide culture, format string, of both. Please see: http://msdn.microsoft.com/en-us/library/system.double.tostring.aspx[^].

For format strings and their effect, please see:
http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx[^],
http://msdn.microsoft.com/en-us/library/0c899ak8.aspx[^].

—SA

您的标签太短 - 实际上显示的是1.2240635382238E-16

Your label is too short - it is actually displaying 1.2240635382238E-16

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