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**Content Feed**

How to classify shapes of this image as square, rectangle, triangle and circle?

Another approach is to calculate the best-fit bounding rectangle of each object, such that the bounding rectangle can be oriente...

7 years ago | 6

| accepted

Question

Determine which function was used to generate hggroup?

Hello everyone, Is there a way to determine which function (e.g., quiver(), scatter(), contour(), etc.) was used to generate ...

7 years ago | 1 answer | 0

### 1

answerHow to average a column based on another column?

This is a good use of accumarray(): [ud,ix,iy]=unique( data(:,1)); output = [ud, accumarray(iy,data(:,2),[],@mean)...

7 years ago | 0

| accepted

How can I write a program to investigate whether a number belongs to matrix?

I think ismember() should do the trick: A=[1 2 3 5 21 2 4 0 11 3]; B = 11; C = ismember(B, A); %returns 1 B =...

8 years ago | 2

| accepted

Creating an array of datenum(s)

If I understand you correctly, this should do it: [~, time_index] = ismember( datenum(tv), second_tv);

8 years ago | 0

How to convert an image from rgb to lab by pixel by pixel matrix???

You can convert rgb to L*A*B colorspace using the makecform() and applycform() functions. From the documentation: cform...

8 years ago | 0

Is there a way to disconnect lines between data points while utilizing the plot function?

Another way is to insert a NaN between the dis-connected points, such as: x = [1;2;3;4;5;6;7;8;6]; y = [10;20;30;40;50;6...

8 years ago | 6

How to calculate the median for each day of the year in 91 years?

I think this is a good use of accumarray(). %some sample data, to illustrate approach Data = [1915 1 1 1000 1010; ...

8 years ago | 0

Finding minimum point from any function file input.

I would check out the documentation for fminsearch() and fminbnd(), or if you have the Optimization Toolbox, fminunc(): doc...

8 years ago | 0

How do I find values in a matrix which are closest to an integer which is the product of a given value?

I think I get what you are trying to do. I think the easiest way might be to use interpolation to fill in the missing values, as...

8 years ago | 1

| accepted

Read data from text file

You should be able to do it with textscan fid = fopen('/path/to/your/file.txt', 'rt'); output = textscan(fid, '%s %s %f ...

8 years ago | 3

and another "if" statement question

How long is the vector? Would this work? if all(A>3) %do something else %do other thing end

8 years ago | 1

| accepted

how to get some values from many text files and put them into the calculation ( please help)

One approach using regular expressions: %variables to average over AveVariables = {'Area', 'xbar', 'ybar', 'IXXw', 'IYY...

8 years ago | 0

| accepted

how to write program for following problem

I'm not going to given you the entire code, but to get you started, here's how you can do the parse: a = 'AD''BA''C'''; %...

8 years ago | 0

levenberg-marquardt in lsqcurvefit

Pass in an options structure: opts = optimset('Algorithm', 'levenberg-marquardt'); [parameters,resnorm,residual,exitflag...

8 years ago | 0

| accepted

Updating bounds in fmincon

You can implement the constraints on psi as a linear inequality constraint. If you check the documentation for your solver (e.g....

8 years ago | 1

How do I create variable names from string variables

If you can, avoid doing this. This explains why: <http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA...

8 years ago | 2

| accepted

Creating a matrix using a loop

[xx,yy]=ndgrid( -2:1:2, -2:1:2); xy = [xx(:), yy(:)]; x = xy(:,1); y = xy(:,2);

8 years ago | 1

| accepted

How to Multiply value in adjacent cell by cell above, Autofil formula in Matlab?

There is no generic "autofill" command. For the example you've given, the following logic would work: StartVar = 5; mult...

8 years ago | 1

| accepted

using multiselect uigetfile with dicomread

You probably need to pass in the full path to your DICOM file to dicomread(). Try this: for count = 1:numel(name) imag...

8 years ago | 1

| accepted

Error using textread to read data containing "INF" or "NaN" with float data

Try using textscan() with the 'TreatAsEmpty' option: output = textscan([direct filename], '%22c %u %f %f %f %f %f %f %f %f ...

8 years ago | 2

How to read from a *.txt file to assign variables and paths

Easiest way is to parse with regular expressions and read into an output structure with named fields. %read in file str ...

8 years ago | 0

| accepted

Solving ODEs using matlab (ode45)

Did you forget the assignment sign? [T, XY] = ode45 ('diffxy', 0 10, [0 1 0])

8 years ago | 0

choose data points that nears each other and store in different matrix

One (non-loop) way: [x1,x2]=meshgrid(A(:,1)); [y1,y2]=meshgrid(A(:,2)); D = sqrt((x1-x2).^2+(y1-y2).^2); %distance m...

8 years ago | 0

| accepted

Solved

Read a column of numbers and interpolate missing data

Given an input cell array of strings s, pick out the second column and turn it into a row vector of data. Missing data will be i...

8 years ago

Solved

Fibonacci sequence

Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

8 years ago

Solved

Relative ratio of "1" in binary number

Input(n) is positive integer number Output(r) is (number of "1" in binary input) / (number of bits). Example: * n=0; r=...

8 years ago

Solved

Vectorizing, too easy or too hard?

Please insert a . before any ^, * or / in the string. That's it!!

8 years ago

Solved

Specific Element Count

Given a vector _v_ and a element _e_, return the number of occurrences of _e_ in _v_. Note: NaNs are equal and there may be n...

8 years ago