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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(...

9年以上 前 | 0

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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 ...

9年以上 前 | 0

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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...

9年以上 前 | 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>.

9年以上 前 | 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...

9年以上 前 | 1

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

9年以上 前 | 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) ...

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 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(...

9年以上 前 | 1

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

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 0

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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])

9年以上 前 | 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 ...

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 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')

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 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)

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 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 ...

9年以上 前 | 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...

9年以上 前 | 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...

9年以上 前 | 4

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