Matlab

Update
I am currently using Matlab 7. I am not able to update to 2010 version using update option in Tools menu. Is there any other way by which I can update? ... 17 Jul 2010 10:52

DAE solution with ode15s
I wrote the following file to solve DAE with ode15s. the value of "A" changes during at 3 s.But, I can not see the transient just in the variable x(:,4). why?: function SDAEPP2 clear all; close all; clc A=0.2; x0=zeros(4,1); x0(4) = 1; %V3 M=diag([1 1 0 0]); options=odeset('Mass',M); tspan=[0 3]; events =... 17 Jul 2010 09:48

Question on 'solve' function and symlinks
Hello. Consider the following example: syms a b c d e f syms x y now define two functions which are partial derivatives of another function f(x,y) fun1 = (4*d + 4*a*x + 4*b*y)*(a*x^2 + 2*b*x*y + 2*d*x + c*y^2 + 2*e*y + f) fun2 = (4*e + 4*b*x + 4*c*y)*(a*x^2 + 2*b*x*y + 2*d*x + c*y^2 + 2*e*y + f) If... 17 Jul 2010 23:51

Question on 'solve' function and symlinks
Hello. Consider the following example: syms a b c d e f syms x y now define two functions which are partial derivatives of another function f(x,y) fun1 = (4*d + 4*a*x + 4*b*y)*(a*x^2 + 2*b*x*y + 2*d*x + c*y^2 + 2*e*y + f) fun2 = (4*e + 4*b*x + 4*c*y)*(a*x^2 + 2*b*x*y + 2*d*x + c*y^2 + 2*e*y + f) If... 17 Jul 2010 09:48

Why does nan*[] get a [] value?
Dear all As you know, 1*[] get [], and 1*NaN can get NaN. Let's see what will gain when Nan*[]? The answer that MATLAB gives is []. Can anyone give me an explanation? best regard mayi 2010-07-17 ... 17 Jul 2010 13:02

Recognize path in save dialog for future save dialog boxes
Dear Maxx, 1. As mentioned in the help of UIPUTFILE, a 3rd input can specify the destination: [filename1, filepath1] = uiputfile('*.png', 'Choose a file'); [filename2, filepath2] = uiputfile('*.png', 'Choose a file', fullfile(filepath1, '*.png'); 2. Change the current directory after the first UIPUTFILE: ... 17 Jul 2010 08:44

Mulyiply one column by another column
I have defined one column of an array as voltage and another column of any array as current. When I multiply voltage by current the answer given is incorrect as it has been divided by 1000. Why is this? I noticed that the comment 1.0e+004 * appears when the answer (Power) is given Power = 1.0e+004 * 0... 17 Jul 2010 08:44

Enumeration in Matlab. Please, need help. Thank You.
Hello, Is it possible to use enumeration in Matlab? In C# an enumeration is as follows: enum Colors { Yellow, Red, Blue }; If not, is there an alternative? This is really useful and since I am using OOP and exporting Matlab code to C#. Thank You, Miguel ... 11 Aug 2010 14:44

DKI levenberg marquardt
Hello! I'm current developping code in Matlab to receive DKI (Diffusional Kurtosis Imaging) images and do a parametric fitting with the levenberg marquard method, in order to discover the aparent diffusion coeficient and the kurtosis term, expressed in the paper: Diffusional Kurtosis Imaging - The Quantification of ... 21 Jul 2010 09:08

maximizing of an objective function
Hi people, I couldn't find any help in help section of matlab, so I need you. I have an objective function in matrix notation with constraints. How can write a matlab formulation solve this maximization problem? You can see the problem here: http://img257.imageshack.us/img257/289/problemu.png ... 19 Jul 2010 09:07