add some code

managed_components/espressif__esp-dsp/examples/matrix/main/CMakeLists.txt

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+idf_component_register(SRCS "dspm_matrix_main.cpp")

managed_components/espressif__esp-dsp/examples/matrix/main/dspm_matrix_main.cpp

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+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "dsp_platform.h"
+#include "esp_log.h"
+
+#include "esp_dsp.h"
+
+static const char *TAG = "main";
+
+// This example shows how to use Mat class from esp-dsp library.
+//
+// First we create matix A and x, and then calculating matrix b as result
+// A*x = b
+// Then we can find x as roots of matrices X and b
+//
+extern "C" void app_main();
+
+void app_main()
+{
+    ESP_LOGI(TAG, "Start Example.");
+    int M = 3;
+    int N = 3;
+    dspm::Mat A(M, N);
+    dspm::Mat x(N, 1);
+    for (int m = 0 ; m < M ; m++) {
+        for (int n = 0 ; n < N ; n++) {
+            A(m, n) = N * m + n;
+        }
+        x(m, 0) = m;
+    }
+    A(0, 0) = 10;
+    A(0, 1) = 11;
+
+    dspm::Mat b = A * x;
+    // Gaussian method
+    dspm::Mat x1_ = dspm::Mat::solve(A, b);
+    // Non Gaussian method
+    dspm::Mat x2_ = dspm::Mat::roots(A, b);
+
+    ESP_LOGI(TAG, "Original vector x:");
+    std::cout << x;
+    ESP_LOGI(TAG, "Solve result:");
+    std::cout << x1_;
+    ESP_LOGI(TAG, "Roots result:");
+    std::cout << x2_;
+    ESP_LOGI(TAG, "End Example.");
+}

managed_components/espressif__esp-dsp/examples/matrix/main/idf_component.yml

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+dependencies:
+  espressif/esp-dsp:
+    override_path: "../../../"
+    version: "*"