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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...

12 years ago | 0

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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...

12 years ago | 0

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Answered
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...

12 years ago | 35

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Answered
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...

12 years ago | 0

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

12 years ago | 1

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

12 years ago | 2

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

12 years ago | 0

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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...

12 years ago | 1

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

12 years ago | 2

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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...

12 years ago | 1

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

12 years ago | 1

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Answered
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 ...

12 years ago | 0

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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...

12 years ago | 4

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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)

12 years ago | 1

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Answered
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'...

12 years ago | 1

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Answered
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...

12 years ago | 0

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Answered
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'...

12 years ago | 0

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

12 years 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...

12 years ago | 2

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

12 years ago | 0

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

12 years 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...

12 years 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

12 years 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 ...

12 years ago | 0

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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 ...

12 years ago | 0

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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 ...

12 years ago | 1

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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...

12 years ago | 0

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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...

12 years ago | 1

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How can I create a vector of 10 random numbers?
If you use an approach like x = rand(20,1); idx = randi(20,10,1); x(idx) = NaN, you may replace less than ten numb...

12 years ago | 0

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How to save the output of a function in an array or cell?
I'm going to assume that the function which returns a matrix with r rows and 2 columns is named returnTwo.m Then use som...

12 years ago | 0