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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(...

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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 ...

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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...

presque 13 ans il y a | 2

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starting MATLAB and not experienced in programming
Also check out the MathWorks' <http://www.mathworks.com/academia/student_center/tutorials/ free MATLAB tutorial>.

presque 13 ans il y a | 0

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Fixed-size text that zooms/scales with a plot?
Here's a cute little function that does what you're looking for. function textWithZoomEffect % plot some original da...

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Dumb mistakes we make with MATLAB.
>> close al Error using close (line 111) Specified window does not exist. Dammit!

presque 13 ans il y a | 1

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solving linear equations using matrices in MATLAB
If you're trying to solve for U in the expression K*U = F, don't use linprog or solve... use mldivide (the backslash operator) ...

presque 13 ans il y a | 1

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what does eigenvalues expres in the covariance matrix?
Long story short: The eigenvalues of the covariance matrix encode the variability of the data in an orthogonal basis that captur...

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Small "toy rocket" - Simulation
You're super close... Just make one change to the height function so it looks like this one below: function [h] = heig...

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Contour Plot from Coordinates
I will assume you have three vectors: x, y, and z (where z represents pressure). For example x = rand(1,100); y = rand(...

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Anonymous functions and integration
Try r = integral (@(x)f(x)'*f(x), 0, 1, 'ArrayValued', true);

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Create orthonormal basis from a given vector
So, given vector v = [a;b;c]; in R^3, it follows that any point (x,y,z) that satisifies a*x + b*y + c*z = 0 (i.e. a poin...

presque 13 ans il y a | 7

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How can I return the last value of a vector?
Try X(end) In general, if X is a m-by-n-by-p-by... You can use X(end,end,end,...) to access element in last r...

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How to color RED to the lower portion of the curve
Replace the plot(x,y) command with area(x,y,'FaceColor',[1 0 0])

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Fincon Warning: undesired gradient requirement
The trust-region-reflective algorithm is the default option for fmincon. You can specify the solver by adding the name-value ...

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Permute problem - unexpected Matlab operator
The first command is invalid. The second command will work - and is what you want - once you remove the extra > at the beginn...

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How to get the positive root of the cubic a*x^3+3*b*x^2+3*c*x+d=0
You can try b = .1:.1:2; a = 1; c = b+2; d = -3; posR = zeros(1,length(b)); for i = 1:length(b) r...

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I want to show intersection of these two spheres. How should I do it?
The spheres you describe have equations 1.) x^2 + y^2 + z^2 = 1 2.) (x-0.25)^2 + (y+1/5)^2 + (z-0.1)^2 = 1 Since equati...

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how to get SNR for 2 images
You'll get different answers, depending on who you're talking to. I would suggest using snr = 20*log(norm(X0,'fro')/no...

presque 13 ans il y a | 1

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How can I construct a dataset array from data on an excel worksheet with an unknown number of rows
Just try d = dataset('XLSFile',yourFileName,'Sheet','mysheet')

presque 13 ans il y a | 0

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Rotate co ordinates by a rotation matrix.
Is that 5 radians or 5 degrees you wish to rotate the points. If it's 5 degrees, I think you mean to have rot = [cosd(5),s...

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using a 'for' loop to create a vector
You are parametrizing your for-loop using a vector of nonintegers, then trying to index into the variable x. I would instead pa...

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"Not enough input arguments" error when integrating a function
You need to use a function handle... try integral(@fun,0,1)

presque 13 ans il y a | 2

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how to combine cells into a matrix
Given your out varialble, try out = fliplr([out{:}]) If you want to flip each row vector, then concatentate use out...

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can anybody please tell me the use of 'val' function in this program.., it is not a valid function,yet the program can't be executed without using this,or by changing the function name.
The lines [fname path]=uigetfile('*.mat'); fname=strcat(path,fname); load(fname ); will load a .mat file into the sco...

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Advice on a few bottlenecks in my code
If you don't need the actual indices, you can omit the find command to save time. In particular, notice that the following code...

presque 13 ans il y a | 0

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Saving variables and figures uniquely when processing a sequence of files
try hgsave(['SummaryPlot',num2str(ii)]); notice the square brackets in order to concatenate 'SummaryPlot' and the outpu...

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Help with timing a pushbutton being pushed twice
Computing the time elapsed between two date vectors is nontrivial, I bet you're getting some weird behavior here. Try using the ...

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How can I resolve this problem using vertcat on matrices for daily files to create a single matrix for the whole year?
So, I'm guessing that newData2 is not a structure, in particular it is a double? Perhaps try fixing your code by replacing th...

presque 13 ans il y a | 0

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how to create a matrix with variables in it?
The best answer to your question will likely depend on what you want to do with A. Sometimes, I find the following commands use...

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