Answered
random permutation for a matrix
That should be easy i = randperm(5); should give you the permutated indices, so that B = A(:,i); is the permutatio...

9 years ago | 1

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Answered
Replace char with other and count total numbers
What do you exactly mean by "this variable which is depicted above" and where would the \n be? I think tdd4c1 answered to you...

9 years ago | 0

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Can Matlab read the most recent made file in the default folder?
Hi, you could get the excel files with d= dir('*xls'); and then compare the dates. These are in d(j).date You p...

9 years ago | 0

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How to plot the function f(x)=x^3 - 4x^2 +1 for x∈[0,25]
You almost got it. Since x is a vector, you should use elementwise operators. not x^2 (what's the square of a vector?) but x.^2...

9 years ago | 1

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Answered
Combination and surface plot
You could try "trisurf". But I agree with John d'Errico that your have too few data. tri=delaunay(cost,consumption); trisu...

9 years ago | 0

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Is it possible to create a function for display variables with their names on figures?
where do you want that printed? Have you considered using the builtin function "title"? ttl = sprintf('N = %d, dt = %1.4f...

9 years ago | 0

Question

clean up standard output when running in background
Hi all, I often run matlab in background, by issuing the following command in linux or mac OS (bash) nohup matlab -nodeskt...

9 years ago | 1 answer | 0

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Answered
How to Integrate these data ?
You could use "cumptrapz". For that you'll need to provide both x and y. In this respect, what do you mean "you choose the st...

9 years ago | 1

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Answered
How to plot a Power Spectrum (log log plot) for an image?
I think that's because f and p are matrices. In that case all of its columns are plotted. The lines you see are plot(f(:,1)...

9 years ago | 0

Question

object properties treated as structures
Hi all, I always thought that you should use get and set to play with object properties. From time to time I stumble on a...

9 years ago | 1 answer | 0

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Answered
axis changes even after "axis equal"
If I understand this correctly, you want an animation with fixed xlim, but you do not want to set the xdata and ydata (I agree w...

9 years ago | 2

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How can I draw a parity plot?
% scatter plot plot(x,y,'.'); hold % bisector (basically the same as Thorsten) plot([0.5 3],[0.5 3]); % upper and low...

9 years ago | 0

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Answered
Replace char with other and count total numbers
I do not see the relevance of strings or newline chars. What is the object you're showing? What is the result of whos x ...

9 years ago | 1

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from random number segregation of values?
I think that this should work :) x=rand; y = 2+1.0*(x>0.31)+3.0*(x>=0.6);

9 years ago | 0

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How to plot point coordinates with connecting lines in between.
that's not matlab syntax. Reading the documentation of "plot" is a good idea here. Type doc plot (enter) Anyway, you should b...

9 years ago | 0

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Plot and animate a 3D Dice Image
perhaps placing dots (circles) instead of numbers on the faces of the dice is easier, at least for a traditional cubic dice. Tha...

9 years ago | 0

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How do you get a number string to display the sign (pos and/or neg) in front of it.
Perhaps use sprintf? For instance, if a, b, c are integers ttl = sprintf('f(x) = %+d x^2 %+d x %+d',a,b,c); title(ttl); ...

9 years ago | 0

Answered
ZERO crossing with certain conditions
I'd go like Y = X-4; c = Y(1:(end-1)).*Y(2:end); Now c(i) should be negative whenever X(i) and X(i+1) are "on different...

9 years ago | 0

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how to properly transfer plotted figure to a MS Word file?
Have you tried tweaking the export setup? Other things you might want to try are changing the marker size or the PaperSize at...

9 years ago | 0

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How to convert a 1D solution to 2D using spherical axis symmetry
This is not very clear. What do you mean by "the _solution_ of a 1D problem of the nature y=f(x)"? It seems to me you're plot...

9 years ago | 0

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Subscript indices must either be real positive integers or logicals.
I guess the line giving grief is x(t) = (F0/m)*(1/wn^2-w^2)*(sin(t.*w)-sin(t.*wn)); x is a vector and t is the subscript ...

9 years ago | 0

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Answered
I need help preallocating array?
Look at the function "zeros". array = zeros(1,5); newArray = zeros(1,5*p); and, in the loop newArray((1+(i-1)*5):(i...

9 years ago | 0

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Answered
How to flip or mirror some vector parts
From the shape of your curve, I guess that you might get roughly the shape you need by setting yd = (y+fliplr(y))/2 wher...

9 years ago | 0

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Answered
Create image axis with the origin in the centre
For the double y axis, see this <http://www.mathworks.com/matlabcentral/answers/98353-how-can-i-show-both-top-and-bottom-or-left...

9 years ago | 0

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Answered
Create an Exponential Function using Taylor Series
Ok John, you want to use a loop instead of using the matrix capabilities of matlab. Imho your code contains both coding [C] a...

9 years ago | 0

Answered
Using errorbar in MATLAB with asymmetric errorbars
My guess is that momeerr95 contains both the upper and the lower values for the errorbars. Or else, how would matlab know that ...

9 years ago | 0

Answered
Place one image on a blank image but several times i.e (passport style)
Hi, you can try the command axes('position',p), where p is a vector specifying the position in the figure. You can create a...

9 years ago | 0

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How to sum multiple matrices?
Product of matrices is "*". Therefore, if they're the same size, D= A*B*C; If instead you want elementwise product, D = A.*B.*C...

9 years ago | 0

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Answered
How to sum multiple matrices?
Hi have you tried the following? D = A+B+C; I'm not sure what you mean with the square parentheses. In matlab square...

9 years ago | 0

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Problems in accessing 2nd column of matrix
Hi, Your code is very obscure. What exactly do you want do attain? In particular, this line temp = xx(xx(k):xx(k+1)); ...

9 years ago | 0