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Looping for find peak of signal
why can't you just use |max| or |findpeaks|? *More per comments* %data 1 valley, two peaks x = rand(1,100)*10; x(20) = -3; x...

15 years ago | 0

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Declaration of Variables
No. It does not. If the input is a string you could convert it to a number and check and see e.g. x = '3'; is_x_a_numb...

15 years ago | 0

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Read vectors into a matrix of NaNs??
repmat({nan},blah) will replicate a cell of nan. You don't want cells ( |doc cell|, for more info). You want a regular matr...

15 years ago | 0

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"find" function - precision problem?
no, it's still the full double precision, you're just not seeing it; show the full thing using format long. format long Time...

15 years ago | 0

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what is the difference between conv2, filter2 and imfilter..?
TMW recommends |imfilter| if you have the IPT and are working with images. Personally, I only use |conv2| since I hate the conv...

15 years ago | 0

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log2(0)=-inf problem
Write your own log2 and call it: function out = mylog2(in) out = log2(in); out(~in) = 0; end Add the F/E output opti...

15 years ago | 1

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how to stop in Gui
Sounds like you want to use a timer: doc timer

15 years ago | 0

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Dynamically plot graphs
I would recommend using |subplot|.

15 years ago | 0

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RK4 in MatLab Help!
So is this script also called vexact? Also, when youc all |feval|, which is unnecessary and could be rewritten as vexact(t,...

15 years ago | 0

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Extract windows from signals
No need for loops: v = 1:40; %sample vector wl = 3; %window length idx = [3 7 21]'; %start indexes v2 = v(bsxfun(@plus,idx...

15 years ago | 1

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Integer check
floor(x)==x

15 years ago | 15

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find values between constants in vector
idx = X >= a & X <= b; where X is your vector, a is the lower bound, b is the upper bound. This will be their logical va...

15 years ago | 1

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How to change mouse arrow to hour-glass for a GUI created by GUIDE?
Put the: set(gcf,'pointer','watch') at the bottom of the automatically generated OpeningFcn, e.g.: function examp...

15 years ago | 0

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How can I save a list of open m-files?
See this question and answers from last week: <http://www.mathworks.com/matlabcentral/answers/15859-can-i-save-preserve-list-of...

15 years ago | 0

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4D regression
Is it a polynomial you're looking for? If so - write out the equations and then put them in matrix form and solve them using ax...

15 years ago | 0

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smooth3
Well from opening |smooth3| open smooth3 and taking a quick look at the code, it looks like the kernel for a box is: ...

15 years ago | 1

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how to draw a plane?
You could also use a |surf| or a |slice|

15 years ago | 0

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Create matrix by adding elements of two vectors?
In reply to the |bsxfun| clarification comments: Think that you are bsxfun. The goal is to apply some function of one of the i...

15 years ago | 0

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How do I delete an entire row if a specific column contains a zero?
X = X(logical(X(:,2)),:); straight conversion to logical will be faster. It is advised to avoid using find and to use logi...

15 years ago | 5

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Print curly braces in a plot
I would recommend starting by reading the tutorial in: doc MATLAB>User Guide>Graphics>Annotating Graphs>Adding Text Anno...

15 years ago | 0

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renaming large variables programmatically
You could try doing it in chunks though there's no guarantee that'll be faster. You could also convert to single precision if n...

15 years ago | 0

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&& trouble !
_delta_ is apparently an array with more than one element so in the second part of the conditional |delta>pi| will also be non-s...

15 years ago | 0

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Matrix with alternating signs in each row vector
b = bsxfun(@plus,k',a(:,1:N)) to your comment in the Fangjun's answer.

15 years ago | 1

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Using imwrite without screen capturing
look at |saveas| doc saveas

15 years ago | 1

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Can I save / preserve list of scripts open in the editor?
Sure: make a new script that calls: edit script1 edit script2 edit script3 %etc. it'll open all of 'em. You might also wa...

15 years ago | 0

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dir problems
It means inside the function you defined a variable as _dir_. dbstop if error Now run your function, it'll blow up ...

15 years ago | 1

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Contourslice error
[r,theta,zg]=meshgrid(r,theta,zg); xg=r.*cos(theta); yg=r.*sin(theta); When you multiply xg,yg by the sine and cosine of the...

15 years ago | 0

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end of line
in |textscan| there is an _end of line_ setting that gives you options: doc textscan

15 years ago | 1

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Hough Transform - Detecting angled lines
I would look at the _eccentricity_ option in |regionprops| doc regionprops

15 years ago | 0

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how to expang an image
Look at the _'InitialMagnification'_ option in both |imshow| and |imtool|

15 years ago | 0