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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Easwaran[/i] [br]I wrote a small program in Matlab to solve an ODE. It is almost same as vdpode of matlab except that the differential equations is changed. The code i wrote is, tspan = [0, pi]; y0 = [0;pi/4]; % Solve the problem using ode45 ode45(@f,tspan,y0); % ------------------------------------------------------------ function dydt = f(t,y) dydt = [sin(y(1))]; I get a error indicating that, "Solving F requires an initial condition vector of length 1." I dont understand why. Since this is a first order equation, one initial condition would suffice. That is why, i have written y0 = [0,pi/4]; But i dont understand what is this error and how can it be rectified. Can somebody help me. With Regards, V. Easwar [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.