How to find sign of a function
If you can evaluate your function with a command like y = yourFcn(x); then you can determine the sign with a logical var...

nästan 10 år ago | 0

How can i simultaneously reference in cells
This is fun... you can try C{1}=[1 2;3 4;5 6] C{2}=[7 8;9 10;11 12] g = @(j)[C{1}(j,:);C{2}(j,:)]'; % function handle...

nästan 10 år ago | 0

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How to make an inset of matlab figure inside the figure.
Maybe try something like x1 = linspace(0,1); x2 = linspace(3/4,1); y1 = sin(2*pi*x1); y2 = sin(2*pi*x2); figure(1) % p...

nästan 10 år ago | 33

Clearing part of an array
Since data is a row of cells, the syntax data{1,8} = {} actually sets the 8th entry of data equal to the empty cell. T...

nästan 10 år ago | 0

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Optimization algorithm into MATLAB
lsqcurvefit is a good candidate... whatever you choose, you'll need your objective to be written as a function

ungefär 10 år ago | 1

Delete rows in a matrix that contain ONLY a negative number
Try isNegRow = all( A==-999, 2 ); A(isNegRow,:) = [];

ungefär 10 år ago | 2

How can I create a variable consisting of data from other (1,1) datasets
newVariable = [Pone,Ptwo,Pthree,Pfour]; ?

ungefär 10 år ago | 0

computing matrices in a loop
Try using <http://www.mathworks.com/help/matlab/cell-arrays.html cells>, as in the example: for i = 1:4 % creates i-by...

ungefär 10 år ago | 1

How do multiple Answers in a post get Accepted?
Hahaha thanks @Matt J... Extra +1 to us for stumbling on the bug!

ungefär 10 år ago | 2

Finding a noninteger value from an array
To do (1) and (2) try y = 0.7; % or y = 0.73; [~,idx] = min(abs(x-y)); % idx contains the index of the value in x cl...

ungefär 10 år ago | 1

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how to remove certain characters from a string in a file
Similar to @Srinivas, you could try str = '32/4/5'; str = regexprep(str,'/.*','');

ungefär 10 år ago | 1

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Scatter plot with graduated marker colours
I wrote a function that is used in the following code as one way to accomplish what you're looking for. Download that function ...

ungefär 10 år ago | 0

Multivariable Optimization with the FMINCON Function
The key is to modify your objective function to be one that can be utilized by the fmincon interface. For example, if your ob...

ungefär 10 år ago | 4

hide one tail of errorbar
Have you tried something like x = linspace(0,1); y = x.^2; err = randn(size(x)); errorbar(x,y,zeros(size(x)),err)

ungefär 10 år ago | 1

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How do I run a program (.m) from simulink (.mdl) using a button?
One approach (short version): Add an annotation to your model, and write the command invoking your program in the annotation'...

ungefär 10 år ago | 1

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Help with optimization tool
The error is occuring because the optim tool is trying to call test2() with a vector input, but you do not declare a vector inpu...

ungefär 10 år ago | 0

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How to change the x ticket lables in a plot?
Try x = 1:12; y = x.^2; plot(x,y); tickLocations = [3,6,9]; % change to whatever you want tickLabels = {'3'...

ungefär 10 år ago | 0

how to convert Cell to string
Modify the command cellfun(f1, num2cell(v),'UniformOutput', false) to cellfun(f1, v,'UniformOutput', false) ...

ungefär 10 år ago | 1

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How to calculate sum of specific array elements
Try x = [ 3 5 2 10 6 4]'; q = [ 0 0 1 2 3 3]'; % note first input must be column vector with positive integers (ind...

ungefär 10 år ago | 2

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WHY THIS ERROR OCCUR ''??? Subscript indices must either be real positive integers or logicals."
Rethink how you're defining/using the variable tn

ungefär 10 år ago | 0

save a data as mat file
try save yourMatFile.mat compact_data

ungefär 10 år ago | 0

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problem with For loop
You are only plotting a single point... That is, the variables r and phi are only scalars (1x1 doubles) when you define x1 and x...

ungefär 10 år ago | 0

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How to include a function into the main directory
You can add the directory containging your function to the MATLAB search path. Try doc pathtool

ungefär 10 år ago | 0

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How do I generate several datasets of random noise on MATLAB?
The command N = randn(1440,1000); will generate 1000 datasets comprising 1440 Gaussian random numbers and store them as ...

ungefär 10 år ago | 0

Displaying in command winodw but i need to store in .txt file
The following code is not ideal in that two for loops are being used where one would suffice. However, it makes it clear which ...

ungefär 10 år ago | 0

how do I count the number of identical rows in a matrix?
Let the N-by-2 matrix you're working with be denoted A. Then, you can get a vector of size M-by-2 containing the unique rows ...

mer än 10 år ago | 1

Looping for Markov Chain
You have all the pieces... its just awkward to organize (below I use cells) and display.. Try something like n = 100; P...

mer än 10 år ago | 0

extract seconds from timestamp in cell
I assume that the timestamp is represented as a string like: C{1} = '2011-04-19T01:01:59.000Z'; Then, try timeStam...

mer än 10 år ago | 1