Question

我对matplotlib和colorbar有疑问。我的项目中有很多热图。假设我的数组是2个数组之间的除法结果。

例如（为了可视化问题）：

class ProductViewModel
{
    OleDbConnection Conn;
    OleDbCommand Cmd;
    List<Products> Productsobj;

    public ProductViewModel()
    {
        string ExcelFilePath = @"ProductData.xlsx";
        string excelConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + ExcelFilePath + ";Extended Properties=Excel 12.0;Persist Security Info=True";
        Conn = new OleDbConnection(excelConnectionString);
    }
    /// <summary>  
    /// Method to Get All the Records from Excel  
    /// </summary>  
    /// <returns></returns>  
    public async Task<List<Products>> ReadRecordFromEXCELAsync()
    {
        Productsobj = new List<Products>();
        await Conn.OpenAsync();
        Cmd = new OleDbCommand();
        Cmd.Connection = Conn;
        Cmd.CommandText = "Select * from [Sheet1$]";
        var Reader = await Cmd.ExecuteReaderAsync();
        while (Reader.Read())
        {
            Productsobj.Add(new Products()
            {
                ProductName = Reader["Product"].ToString(),
                OriginYear = Convert.ToInt32(Reader[" Origin Year"]),
                DevelopmentYear = Convert.ToInt32(Reader[" Development Year"]),
                IncrementalValue = Convert.ToDouble(Reader[" Incremental Value"])
            });
        }
        Reader.Close();
        Conn.Close();

        return Productsobj;
    }

    public void DisplayData()
    {
        int maxYear = Productsobj.Max(t => t.OriginYear);
        int minYear = Productsobj.Min(t => t.OriginYear);
        DateTime max = new DateTime(maxYear, 1, 1);
        DateTime min = new DateTime(minYear, 1, 1);
        int years = Years(min, max);
    }

    public int Years(DateTime start, DateTime end)
    {
        return (end.Year - start.Year) +
            (((end.Month > start.Month) ||
            ((end.Month == start.Month) && (end.Day >= start.Day))) ? 1 : 0);
    }

    public void CalculateAccumulativeData()
    {
        var paymentdata = from p in Productsobj
                          group p.ProductName by new { };

        foreach (var data in paymentdata)
        {
            System.Diagnostics.Debug.WriteLine(data.Key);
            foreach (var listing in data)
            {
                System.Diagnostics.Debug.WriteLine("\t{0}", listing);
            }
        }
        Productsobj.ForEach(item => System.Diagnostics.Debug.WriteLine(item.OriginYear + "," + item.IncrementalValue));
    }
}

==＆GT;但是，即使我的数据有99％的分数是好的，我从array_1和array_2获得平均值，例如，值为1。有时我有几个点（1％），例如A / B之间的结果是1000000，并使我的颜色条错误。

==＆GT;如何使用彩条来打印我的热图只能在[0; 1]之间进行打印？那就是说，要有一个动态的颜色条？

我为我非常糟糕的英语道歉：/

谢谢！

Answer 1

我想有两种解决方案：设置vmin的{{1}}和vmax参数，或掩盖数组中的无效值。

imshow

导致：

或者，如果要屏蔽无效值（假设大于1的所有内容都无效）：

import numpy as np
import matplotlib.pylab as plt

A = np.random.random((20,20))
B = np.random.random((20,20))

array_1 = A/B    # A and B are 2 arrays, same shape etc ..

fig1 = plt.figure()
ax1  = plt.subplot(121)
fig_step1 = ax1.imshow(array_1, interpolation='nearest')
fig1.colorbar(fig_step1,ax=ax1)
ax1.set_xlabel("X (arcmin)")
ax1.set_ylabel("Y (arcmin)")
ax1.set_title("Without limits")

ax2  = plt.subplot(122)
fig_step2 = ax2.imshow(array_1, interpolation='nearest', vmin=0, vmax=1)
fig1.colorbar(fig_step2, ax=ax2)
ax2.set_xlabel("X (arcmin)")
ax2.set_ylabel("Y (arcmin)")
ax2.set_title("With limits")

结果是：

将颜色条设置为数据功能

1 个答案: