轮廓线的位置

Question

以下是我的代码和情节：

import matplotlib
import matplotlib.mlab as mlab
import matplotlib.cm as cm
import matplotlib.pyplot as plt
import numpy as np
%matplotlib inline

delta = 0.00025
A=0
x = np.arange(0, 0.10, delta)
y = np.arange(0, 0.1, delta)
X, Y = np.meshgrid(x, y)
Z = A*(X**2+Y**2)+2*X*Y

manual_locations = [(0.1,0.1), (0.2,0.2), (0.3,0.3), 
                    (0.015, 0.015), (0.00255, 0.0025), (0.00005,0.00005)]
line_widths = (1, 1, 1, 1, 1, 1)

plt.figure()
CS = plt.contour(X, Y, Z, 6,                        # add 6 contour lines
                 linewidths=line_widths,            # line widths
                 colors = line_colours)             # line colours

plt.clabel(CS, inline=1,                            # add labels
          fontsize=10,                             # label font size 
          manual=manual_locations)                 # label locations
plt.title('Indifference Map')        # title

plt.show()

似乎我的manual_locations什么也没做，python自动选择等距轮廓线。虽然我想调查0附近的更多细节。我怎样才能看到更多曲线/等高线收敛到（0,0）？ 提前谢谢。

Answer 1

更详细地探索部分数据的最简单方法是使用 <?php use yii\helpers\Html; use app\modules\admin\models\TransLabels; use app\modules\admin\models\TransText; $ids = $_GET['id']; // echo $ids; $model = TransLabels::find()->where(['trans_page_title' => $ids])->all(); // echo '<pre>';print_r($model);die(); ?> <table class="table table-striped table-bordered" > <thead> <tr> <th>Labels</th> <th>English</th> <th>Spanish</th> <th>French</th> <th>German</th> </tr> </thead> <tbody> <form action="<?php echo Yii::$app->homeUrl;?>admin/text/translate" method="post" > <?php if (Yii::$app->session->hasFlash('success')) {?> <div> <center><h1><span style="color:green; text-align:centre "><?php print_r(Yii::$app->session->getFlash('success')); ?> </span></h1></center> </div> <?php } ?> <?php foreach($model as $expertn) { $title=$expertn['trans_labels']; $label_id = $expertn['trans_label_id']; $sql = TransText::find()->where(['trans_text_label'=>$label_id])->all(); $eng = $sql[0]->English; $span = $sql[0]->Spanish; $fren = $sql[0]->French; $ger = $sql[0]->German; $text_id = $sql[0]->trans_text_id; // echo '<pre>';print_r($ger); // echo $expertn['trans_label_id']; echo '<tr>'; // start a new row echo '<td data-label="Payment">'; echo $expertn['trans_labels']; echo '<input type="hidden" name="text_id[]" value="'.$text_id.'"/>'; echo '<input type="hidden" name="label_id[]" value="'.$expertn['trans_label_id'].'"/>'; echo '</td>'; echo '<td data-label="Issue Date">'; echo '<input type="text" name="english[]" value="'.$eng.'"/>'; echo '</td>'; echo '<td data-label="Issue Date">'; echo '<input type="text"name="spanish[]" value="'.$span.'"/>'; echo '</td>'; echo '<td data-label="Issue Date">'; echo '<input type="text"name="french[]" value="'.$fren.'"/>'; echo '</td>'; echo '<td data-label="Issue Date">'; echo '<input type="text"name="german[]" value="'.$ger.'"/>'; echo '</td>'; // echo '<td>'; // echo $expertn['tcount']; // echo '</td>'; echo '</tr>'; } echo '<input type="submit" name="submit" id="sub" value="Save" class="btn btn-primary bton"/>'; ?> </form> </tbody> </table> 。这将设置要检查的Z值，并在您的问题中将此短语称为要检查的（x，y）位置，但它与levels如何工作以直接指定位置点相反。

您还可以通过适当更改绘图的边界来检查（0,0）区域。

下面，我使用contour的日志值，但线性值同样有效，更常见，更易于理解。日志值很容易强调您最感兴趣的部分。

levels

如果您确实需要特定位置的轮廓，可以将该位置的（x，y）值放入等式中以计算该位置的z值，然后将此值用作其中一个值在import matplotlib import matplotlib.mlab as mlab import matplotlib.cm as cm import matplotlib.pyplot as plt import numpy as np #%matplotlib inline delta = 0.00025 A=0 x = np.arange(0, 0.10, delta) y = np.arange(0, 0.1, delta) X, Y = np.meshgrid(x, y) Z = A*(X**2+Y**2)+2*X*Y manual_locations = [(0.1,0.1), (0.2,0.2), (0.3,0.3), (0.015, 0.015), (0.00255, 0.0025), (0.00005,0.00005)] line_widths = (1, 1, 1, 1, 1, 1) plt.figure() CS = plt.contour(X, Y, Z, 6, # add 6 contour lines linewidths=line_widths, #levels=np.linspace(0, .003, 20)) levels=np.logspace(-5, -2, 20)) plt.clabel(CS, inline=1, # add labels fontsize=10, fmt="%.5f") plt.title('Indifference Map') # title plt.show() 参数中。