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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>.

más de 11 años hace | 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...

más de 11 años hace | 1

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

más de 11 años hace | 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) ...

más de 11 años hace | 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...

más de 11 años hace | 3

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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...

más de 11 años hace | 1

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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(...

más de 11 años hace | 1

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

más de 11 años hace | 1

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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...

más de 11 años hace | 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...

más de 11 años hace | 1

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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])

más de 11 años hace | 1

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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 ...

más de 11 años hace | 0

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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...

más de 11 años hace | 1

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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...

más de 11 años hace | 0

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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...

más de 11 años hace | 0

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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...

más de 11 años hace | 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')

más de 11 años hace | 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...

más de 11 años hace | 0

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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...

más de 11 años hace | 2

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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)

más de 11 años hace | 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...

más de 11 años hace | 1

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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...

más de 11 años hace | 0

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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...

casi 12 años hace | 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...

casi 12 años hace | 0

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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 ...

casi 12 años hace | 0

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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...

casi 12 años hace | 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...

casi 12 años hace | 6

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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...

casi 12 años hace | 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...

casi 12 años hace | 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...

casi 12 años hace | 35

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