Question

我正在尝试使用ODE45 MATLAB解决一个非线性微分方程系统，我做了很多次成功，但这次我得到以下错误，我真的不知道什么是错的，我很困惑。这是代码。

%%这是错误：

$('document').ready(function() {
  $("#login-form").on("submit", (function(e) {
    e.preventDefault();
    var data = $("#login-form").serialize();

    $.ajax({
      type: 'POST',
      url: 'login-response.php',
      data: data,

      success: function(response) {
        console.log(response.length);

        if (response == true) {
          $("#btn-login").html('<img src="btn-ajax-loader.gif" /> &nbsp; Signing In ...');
          setTimeout(' window.location.href = "demo.php"; ', 4000);
        } else {
          $("#error").fadeIn(1000, function() {
            $("#error").html('<div class="alert alert-danger"> <span class="glyphicon glyphicon-info-sign"></span> &nbsp; ' + response + ' !</div>');
            $("#btn-login").html('<span class="glyphicon glyphicon-log-in"></span> &nbsp; Sign In');
          });
        }
      }
    });
  }));
});

%%方程式在函数中定义：

session_start();
$user_email = $_POST['user_email'];
$user_password = $_POST['password'];

if ($user_email == 'admin' && $user_password == '123') {
    $_SESSION['user_session'] = $user_email;
    echo json_encode(true);
}
else {
    echo "email or password does not exist."; // wrong details
}

%%，这里函数被ODE45调用来解决：

Subscript indices must either be real positive integers or logicals.

Error in non_L_ss (line 6)
        (-Fk*(ds0+x(3)-x(1))+Fk*ds0-Fc(x(4)-x(2)))/ms +Fa/ms ] ;

Error in odearguments (line 87)
f0 = feval(ode,t0,y0,args{:});   % ODE15I sets args{1} to yp0.

Error in ode45 (line 115)
odearguments(FcnHandlesUsed,solver_name,ode, tspan,y0,optio varargin);

Error in solve (line 50)
[t X]=ode45(@non_L_ss,t_span,IC);

Answer 1

Subscript indices must either be real positive integers or logicals.

Error in non_L_ss (line 6)
    (-Fk*(ds0+x(3)-x(1))+Fk*ds0-Fc(x(4)-x(2)))/ms +Fa/ms ] ;

表示您将某些内容用作具有非整数索引的索引数组。这可能意味着该对象根本就没有数组。我建议更换

Fc(x(4)-x(2))

通过

Fc*(x(4)-x(2))

试图解决这个问题。

用ODE45求解Matlab中微分方程的非线性系统

1 个答案: