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‎src/pkg/MatPly_Dart/doc/API/Dart/constructor.md‎

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* */
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```
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## 获取对称对角阵，设置sub为true得到副对角线对称阵[new from V1.0.7]
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```text
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MatrixType.Diag({
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required int n,
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required double start,
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required double end,
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bool sub = false,
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int? seed
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})
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```
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### example
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```dart
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import 'core.dart';
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main(){
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MatrixType.Diag(n: 5, start: 1, end: 5, seed: 1)..visible();
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MatrixType.Diag(n: 5, start: 1, end: 5, seed: 2, sub: true)..visible();
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}
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/*
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output
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[
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[1.00501 3.25434 1.77322 4.23496 3.34004 ]
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[3.25434 2.91949 2.40117 4.58385 4.29136 ]
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[1.77322 2.40117 3.98642 1.69643 4.43577 ]
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[4.23496 4.58385 1.69643 3.84201 3.05414 ]
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[3.34004 4.29136 4.43577 3.05414 2.21598 ]
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]
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[
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[2.81829 4.53539 4.92505 3.23591 4.59923 ]
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[1.87490 1.81277 1.07398 2.30680 3.23591 ]
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[3.30927 4.70702 2.54448 1.07398 4.92505 ]
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[4.67260 4.63939 4.70702 1.81277 4.53539 ]
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[2.34758 4.67260 3.30927 1.87490 2.81829 ]
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]
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* */
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```
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‎src/pkg/MatPly_Dart/doc/API/Dart/methods.md‎

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## mirror[new from V1.0.6]
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获取矩阵的镜像，mode == 0表示横向镜像、其他值表示总线镜像
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## decentralizate[new from V1.0.7]
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获取去中心化的矩阵
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## covariance[new from V1.0.7]
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计算两个矩阵的协方差值
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## cov[new from V1.0.7]
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当不传入另一个矩阵时，计算当前矩阵的协方差矩阵，否则获取二者的协方差矩阵。底层实现时，视纵向为变量，横向为特征
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## pearsonCoef[new from V1.0.7]
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皮尔森系数计算
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## MSE[new from V1.0.7]
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均方误差。在几个评分标准中，传入的矩阵参数（rea）表示真实数据，而本身表示预测数据
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## RMSE[new from V1.0.7]
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均方根误差
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## MAE[new from V1.0.7]
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平均绝对误差
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## MAPE[new from V1.0.7]
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平均绝对百分比误差
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## R2[new from V1.0.7]
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决定系数
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## SMAPE[new from V1.0.7]
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对称平均绝对百分比误差
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## fill_diagonal[new from V1.0.7]
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对矩阵的最小维度对角上的值换为number
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## choice[new from V1.0.7]
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如果根据权重获取数据，权重可以是等列长一维列表，也可以是同形状矩阵。视行为样本。其中method方法分别为0、1、其他整数时，权重映射为原值、sigmoid函数值、绝对值；如果不传入权重，则按照等概率处理

‎src/pkg/MatPly_Dart/doc/Guide/getting-started.md‎

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# 支持的语言与平台一览
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## [Dart on Windows](../API/Dart/index.md)
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## [Dart on Windows/Linux/Android](../API/Dart/index.md)

‎src/pkg/MatPly_Dart/doc/index.md‎

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# MatPly
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```text
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__ ___ __ ____ __
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/ |/ /___ _/ /_/ __ \/ /_ __
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/ /|_/ / __ `/ __/ /_/ / / / / /
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/ / / / /_/ / /_/ ____/ / /_/ /
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/_/ /_/\__,_/\__/_/ /_/\__, /
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/____/
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__ ___ __ ____ __
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/ |/ /___ _/ /_/ __ \/ /_ __
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/ /|_/ / __ `/ __/ /_/ / / / / /
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/ / / / /_/ / /_/ ____/ / /_/ /
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/_/ /_/\__,_/\__/_/ /_/\__, /
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/____/
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```
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## 什么是MatPly？
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> MatPly是使用C语言为基础，利用其他语言特性实现的矩阵库
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> MatPly是使用C语言实现并被转换为多个语言版本的矩阵操作库
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> 目前提供的语言以及支持平台的版本有：
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> - Windows平台下Dart语言版本
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> - Windows/Linux/Android平台下Dart语言版本
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## 网页文档版本
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> [https://www.robot-shadow.cn/src/pkg/MatPly_Dart/site/](https://www.robot-shadow.cn/src/pkg/MatPly_Dart/site/)
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## Github地址
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> [https://github.com/PythonnotJava/MatPly](https://github.com/PythonnotJava/MatPly)
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‎src/pkg/MatPly_Dart/site/API/Dart/constructor/index.html‎

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</ul>
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<a href="#subtruenew-from-v107" class="md-nav__link">
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<span class="md-ellipsis">
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获取对称对角阵，设置sub为true得到副对角线对称阵[new from V1.0.7]
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</span>
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</a>
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<nav class="md-nav" aria-label="获取对称对角阵，设置sub为true得到副对角线对称阵[new from V1.0.7]">
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<ul class="md-nav__list">
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<li class="md-nav__item">
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<a href="#example_12" class="md-nav__link">
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<span class="md-ellipsis">
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example
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</ul>
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<li class="md-nav__item">
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<a href="#subtruenew-from-v107" class="md-nav__link">
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<span class="md-ellipsis">
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获取对称对角阵，设置sub为true得到副对角线对称阵[new from V1.0.7]
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</span>
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</a>
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<nav class="md-nav" aria-label="获取对称对角阵，设置sub为true得到副对角线对称阵[new from V1.0.7]">
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<ul class="md-nav__list">
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<a href="#example_12" class="md-nav__link">
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<span class="md-ellipsis">
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example
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</a>
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</ul>
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</nav>
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]
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* */
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</code></pre>
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<h2 id="subtruenew-from-v107">获取对称对角阵，设置sub为true得到副对角线对称阵[new from V1.0.7]</h2>
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<pre><code class="language-text"> MatrixType.Diag({
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required int n,
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required double start,
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required double end,
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bool sub = false,
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int? seed
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})
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</code></pre>
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<h3 id="example_12">example</h3>
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<pre><code class="language-dart">import 'core.dart';
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main(){
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MatrixType.Diag(n: 5, start: 1, end: 5, seed: 1)..visible();
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MatrixType.Diag(n: 5, start: 1, end: 5, seed: 2, sub: true)..visible();
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}
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/*
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output
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[
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[1.00501 3.25434 1.77322 4.23496 3.34004 ]
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[3.25434 2.91949 2.40117 4.58385 4.29136 ]
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[1.77322 2.40117 3.98642 1.69643 4.43577 ]
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[4.23496 4.58385 1.69643 3.84201 3.05414 ]
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[3.34004 4.29136 4.43577 3.05414 2.21598 ]
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]
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[
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[2.81829 4.53539 4.92505 3.23591 4.59923 ]
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[1.87490 1.81277 1.07398 2.30680 3.23591 ]
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[3.30927 4.70702 2.54448 1.07398 4.92505 ]
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[4.67260 4.63939 4.70702 1.81277 4.53539 ]
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[2.34758 4.67260 3.30927 1.87490 2.81829 ]
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]
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* */
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</code></pre>
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