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...

mer än 9 år 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

mer än 9 år 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,:) = [];

mer än 9 år 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]; ?

mer än 9 år 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...

mer än 9 år 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!

mer än 9 år 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...

mer än 9 år 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,'/.*','');

mer än 9 år 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 ...

mer än 9 år 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...

mer än 9 år 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)

mer än 9 år 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'...

mer än 9 år 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...

mer än 9 år 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'...

mer än 9 år 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) ...

mer än 9 år ago | 1

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Answered
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...

mer än 9 år 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

mer än 9 år ago | 0

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

mer än 9 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...

mer än 9 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

mer än 9 år ago | 0

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Answered
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 ...

mer än 9 år 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 ...

mer än 9 år 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 ...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år ago | 0

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Function Max for Cell
Try Mb = max([b{:,2}]);

mer än 9 år ago | 0

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Answered
How to count consuctive 0's inbetween values of 1
This is a fun one. Try count = reshape(count,1,[]); % make it a row vector store = [nnz(cumsum(count)==0),... ...

mer än 9 år ago | 1

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Answered
Matrix Combination String and Number Inside
A string is not the same type as a number in MATLAB. One is type char, the other is (by default) type double. To store variabl...

mer än 9 år ago | 0

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