gradient

一些matlab常用命令函数，便于matlab编程爱好者学习参考(Some of the Matlab command function, easy to Matlab programming enthusiasts to learn reference)

这里我们针对三级固体火箭进行研究，主要考虑每一级发动机工作时推力 和比冲 与发动机试车存在摄动偏差（相差 ）时所产生火箭关机点时刻的状态偏差。火箭的飞行的动力学方程可建立在地面发射坐标系中，火箭的第一级、第二级和第三级按照固定的俯仰角程序飞行，第二、三级飞行时已在大气层外，此时可忽略气动力的影响。(Here we study for three solid rocket, the main consideration at every level when the engine thrust and state arising the moment the rocket off point perturbation deviation (difference) in the presence of specific impulse and engine test bias. Outside of the rocket flight dynamics equations can be established on the ground coordinate system launch, the rocket s first stage, the second and third stages according to a fixed elevation angle of flight procedures, and the second, when the third flight already in the atmosphere, this when can ignore the effects of gas dynamics.)

基于matlab的自组织神经网络进行遥感图像分类处理(Matlab based on the self-organizing neural network for remote sensing image classification processing)

Simple implementation of DFT/IDFT in matlab

基于matlab的锁相环（PLL）仿真源代码(Matlab based on the phase-locked loop (PLL) simulation source code)

Parametric analysis method for knock detection in injection engine

matlab中直线检测的代码包括图像滤波、分割、边缘检测等，很实用的程序(Image processing algorithms in the opening operation code can be used directly, a very useful program)

说明：  线性调频信号的产生，用MATLAB实现，脉宽25，扫描带宽20MHZ，取样频率20MHZ，时频积为50，并给出其频率特性(LFM signal produce)

Implementation of skewness. Much better then the Matlab function

Prueba1 FletcherReeves Hernández Santiago José Maestría en Ciencias de la Computación Septiembre / 2011 1. Comenzar con un punto arbitrario 2. Calcular Gradiente de Fi 3. Si el Gradiente Fi es igual a 0(converge), termina 4. Si el Gradiente Fi es !=0 continuar 5. Encontrar dirección de búsqueda Si= -GradienteFi= - Gradiente F(Xi) 6. Determinar la Longitud Optima del incremento lamda(i) en dirección Si X(i+1)=X(i)+lamda(i)*S(i)= X(i)-lamda(i)*Gradiente F(Xi) 7. Hacer i=2 8. Obtener Gradiente Fi 9. Calcular Si= -GradFi + ( [abs(GradFi)^2]/[abs(GradF(i-1))^2] )*S(i-1) 10. Determinar la Longitud Optima del incremento lamda(i) en dirección Si X(i+1)=X(i)+lamda(i)*S(i)= X(i)-lamda(i)*Gradiente F(Xi) 7. Verificar Optimalidad de X(i+1) Si es optimo, detener Si no es optimo hacer i=i+1 e ir al paso 8