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**Content Feed**

Record timing of user input

I think you want |tic| and |toc|, as in the example below: % I will create a cell that represents some collection of images...

ungefär 8 år ago | 2

| accepted

how do i vectorise given code?

I do not see how the example you provided will execute if |A| is any standard MATLAB data type. In particular, if |A| is a MA...

mer än 8 år ago | 0

Return specified rows of a vector

Try A = [4;8;2;3;8;6]; i = [1;3;5;6]; B = A(i)

mer än 8 år ago | 1

| accepted

Need half of my contour plot

Check out the |tril| and |triu| functions. For example if you have data similar to [x,y]= meshgrid(-1:.05:1); z = x.^2+...

mer än 8 år ago | 0

| accepted

Question

What would you do?

Suppose you have a string like rhs = 'x*cos(x)/(t+1)'; and that you want to create a function handle... would you do ...

mer än 8 år ago | 2 answers | 0

### 2

answersIs this even possible?

Have you tried right-clicking on the file from the current folder browser? In the context-menu that pops up you should see some...

mer än 8 år ago | 0

Simple Question about Optimization of Nested IF-FOR loops

First of all, it appears that each time through the outer-most loop (the first one), the variable |iPointsinSlice| does not chan...

mer än 8 år ago | 0

Subscript indices must either be real positive integers or logicals

There are several issues you need to resolve with your code before it will run. First, there is no increment operator in MATLAB...

mer än 8 år ago | 0

| accepted

Convert vector to cell array

The third input to the |fints| function is a cell array of strings that can be valid MATLAB identifiers. That is, the strings c...

mer än 8 år ago | 0

| accepted

How to visualize the matrix with colored entries

What are the features that make your data suspicious? For example, if the suspicious data is all very large (say 2 standard dev...

mer än 8 år ago | 0

How to do a 3D circle in matlab

I assume you do not have a parametric form for the circle in 3D, but you do have the equation for the plane where the circle liv...

mer än 8 år ago | 5

Simpl equestion about CUMSUM

I don't think I would use cumsum here. Instead, try A = sum(bsxfun(@gt,B',0:299)); Note, this command above assumes B i...

mer än 8 år ago | 0

| accepted

match the first letter in a cell and save

Try this (I assume your cell is called |variable|) idx = cellfun(@(s)strncmp(s,'P',1),variable) newCell = variable(idx);...

mer än 8 år ago | 0

| accepted

how to remove NaN

You're very close try % idx(i) is true if contents in row i, column 6 of M equals NaN idx = cellfun(@isnan,M(:,6)) ...

mer än 8 år ago | 1

PLOT COMMAND USING string arguments

Maybe try x = eval(get(text1,'string')); y = eval(get(text2,'string')); axes(plot1); plot(x,y);

mer än 8 år ago | 0

| accepted

calculate a vector from consecutive vectors without a loop

Totally.. try something like yourVector = 1:100; avgWindow = 1/10*ones(1,10); % each value is 1/10 movingAverage ...

mer än 8 år ago | 1

| accepted

Sliders in Matlab GUI

Check out this simple function.. you should be able to copy and paste it into a new file, save the file with the name |simplePro...

mer än 8 år ago | 0

| accepted

lines to curves drawing problem

I assume you have the variables |x| and |y| which are vectors representing the values in the x-component and in the y-component ...

mer än 8 år ago | 2

| accepted

Create an image stack (3-D matrix)

Execute this command after your code above to get the three gray-scale images you create into one 3D matrix of grayscale image...

mer än 8 år ago | 0

| accepted

create a function handle extracting pieces from a matrix function handle

Starting from your example A = @(x) [1 2 x; 2*x x.^2 3]; you probably realized that *this command is not allowed* B...

mer än 8 år ago | 1

| accepted

How can I calculate and compare the energy of the curvelet coefficients to compare in thresholding code?

When you decompose a function |f| in an orthonormal basis, you can relate the sum of the square of the coefficients to the L2-no...

mer än 8 år ago | 0

| accepted

Matrix is close to singular or badly scaled

There is a closed form expression for the inverse of a 2-by-2 matrix <http://mathworld.wolfram.com/MatrixInverse.html here> (see...

mer än 8 år ago | 1

| accepted

Loop variable names and file names

Check your |for|-loop. The iteration variable is |iName|, but you use |i| in the loop's body. Since you do not define |i|, MATL...

mer än 8 år ago | 0

| accepted

How do I add a 2D Plot along with a surface or mesh plot in MATLAB?

Does this get you started? % create figure figure % Generate data to make a surface x = -1:0.1:1; y = -1:0...

mer än 8 år ago | 1

| accepted

second order nonlinear ode with polynomial terms

You must write the ODE as a system of first-order ODEs. Use the substitution u1 = y and u2 = y'. Then, you'll end up with equa...

mer än 8 år ago | 0

Force polynomial fit through multiple points

I assume your data is given by two row vectors xData and yData, given for example by xData = linspace(-2,2); yData = 2.3...

mer än 8 år ago | 2

solving non linear third order algebaric expressions using newton rapson method or any other method!!!

The |fsolve| function needs a function handle as input. So create a file with the command edit yourFun.m and paste this...

mer än 8 år ago | 0

can fzero be used to find the minimum ?

Do you have the optimization toolbox? To start you can begin with the fminbnd function. For example, say your function is g(...

mer än 8 år ago | 0

| accepted

How to sum part of a column?

If your matrix is called A, then rows 1 and 2 in column 3 can be identified with the syntax A( 1:2, 3 ) So sum it using ...

mer än 8 år ago | 0

| accepted

Save Variable in Command Window

You want to use the function |path| so don't create a new variable called |path|! Instead try this prompt = 'Enter the pat...

mer än 8 år ago | 2