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I have a mxn matrix. How can I change its elements to either 1 or 0 based on a condition such as: if an element of mxn is <x, then set it to 0 otherwise set it to 1.
Let M be your m-by-n matrix. M = double(M>=145);

presque 10 ans il y a | 1

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Help finding the min and max of a matrix without using min/max commands
Change the two lines max=mat2; min=mat2; to max = -inf; min = inf; Note: It is a poor practice to use ...

presque 10 ans il y a | 0

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Help with iteration!!?
Your while-loop does not seem to be very useful. On the first pass through it sets Wd equal to Wdf and because the "(Wdf-Wd)> 0...

presque 10 ans il y a | 0

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To reshape the number of elements must not change matlab error
It looks to me as though your original 'bits' array contains a number of elements other than n*m. You can't change the total nu...

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check points inside triangle or on edge with example
Suppose P1 = [x1,y1], P2 = [x2,y2], and P3 = [x3,y3] are row vectors giving the coordinates of the three vertices of a triangle,...

presque 10 ans il y a | 2

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Calculate Exponentials WITHOUT built-in exponent function?
Trying to compute x^n using only summation is a terrible method. Surely you would be allowed to use multiplication! ExpVa...

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How to increase the speed of this code?
Try 'ndgrid': [X,Y,Z] = ndgrid(0.01:0.01:1); pts = [Z(:),Y(:),X(:)]; %(Corrected)

presque 10 ans il y a | 0

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Keep getting error: Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit',N) to change the limit. Be aware that exceeding your available stack space can crash MATLAB and/or your computer.
Your code is clearly meant to be recursive. However, there is something wrong in the way it is planned. You first call "equili...

presque 10 ans il y a | 0

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Monte Carlo Experiment in Huffman
In case you don't have access to a huffman compression algorithm, I would expect in your particular case the huffman encoding wo...

presque 10 ans il y a | 0

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How to get the inverse function when it's only 1-1 in certain range?
As you have defined iphi2 it is simply one of the two solutions to a quadratic equation: z = 1-sqrt(1-phi2)

presque 10 ans il y a | 0

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I want to make this assignment : Const = log(2)/703 800 000 but i keep getting this error massage, 'Matrix dimensions must agree' and I have no idea what that even means. How do I go about this?
If "730 800 000" is meant to be a three-element row vector you need to write: const = log(2)./[730 800 000]; If "730 80...

presque 10 ans il y a | 0

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Error using ==> times Matrix dimensions must agree.
Your vector t is a row vector, that is, presumably 1 by 1024 in size. If there is no complaint in plot(t,x), then x must also b...

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How to write function that recognizes whether a year (e.g2010) input by user is leap year or not
I recommend you put matlab's 'mod' function to good use. Here is one way: t = mod(y,4)==0 & (mod(y,100)~=0 | mod(y,400)==...

presque 10 ans il y a | 0

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How to get rid of the error: Error using horzcat. Dimensions of matrices being concatenated are not consistent.
Both the expressions for A and B are invalid. In A the three quantities zeros(3,3), eye(3,3), zeros(3,1) have a total ...

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Solving the following integral in MatLab
If b and c are both nonzero, then as x approaches infinity the factor exp(-c*x/(a-b*x)) approaches exp(c/b) which would be nonze...

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finding four solution in an interval
Use matlab function 'fzero' to find solution to fun = @(x) exp(-2*x).*sin(x+4)-0.4; x = fzero(fun,x0); where x0 is ...

presque 10 ans il y a | 0

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Help-Integration of Bessel functions
It is likely that an explicit expression for either of those integrals as functions of 'a' is not known in mathematics and there...

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Help-Integration of Bessel functions
Use numerical integration with matlab's 'integral' function or one of the other quadrature functions.

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Trying to use quad to solve this integral but keep getting error
You've forgotten the dot in your division. It should be: y = @(x)((1.941-24.3*x).^2)./(2.92*(0.02408-x)*(0.01605-x));

presque 10 ans il y a | 0

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fill matrix randomly with a specific number of units
The tough part of your requirement is to not duplicate rows. The following while-loop is intended to accomplish that. v =...

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How to generate a random integer betwwen a and b inclusive.
x = 9*rand(n,1)+1; As to "inclusive" this will never give exactly 1 or exactly 10. However if you intended to have an uni...

presque 10 ans il y a | 0

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comparing numbers on the same vector
y(1) = true; for k = 2:length(x) y(k) = (max(x(1:k-1))<x(k)); end y = double(y);

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To reflect a contour plot
If your symmetry is in the left-right direction, then do: contour(V(:,end:-1:1),500); However, that leaves the two imag...

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Using ode45 to solve second order differential system
The same single function 'x' cannot in general satisfy two different differential equations, so you need to solve these equation...

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Finding angle between thee points
To find the angle rotating counterclockwise from point P1(x1,y1), pivoting around point P2(x2,y2), and ending at point P3(x3,y3)...

environ 10 ans il y a | 0

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how to calculate all permutations of ['a' 'b' 'c' ... 'x' 'y' 'z'] just 26 characters, yet combinator.m combinations.m return errors
@John: I think you fail to grasp the enormity of 26 factorial. Suppose one of us could come up with your requested scheme of pr...

environ 10 ans il y a | 3

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I am trying to obtain a series of vectors made of elements from a larger vector given they exceed a threshold
It's not clear whether you want those Z elements which exceed some fixed value or those which make up a monotone increasing sequ...

environ 10 ans il y a | 0

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How to plot a 3rd order best fit line through 3 sets of data?
How about x1 = [Cv80(:);Cv50(:);Cv30(:)]; y1 = [Cp80(:);Cp50(:);Cp30(:)]; p = polyfit(x1,y1,3); y = polyval(p,x1);...

environ 10 ans il y a | 0

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How to solve 5 quadratic equations simultaneously
For that particular set of equations you could take steps to make things easier. Introduce a new unknown 't': t = LIDtot-x...

environ 10 ans il y a | 2

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When I plot, I only get 5 red dots and a blank graph.
You should make two changes: x = linspace(0, 1, w); (or just linspace(0,1) and get the default hundred points) VR = ...

environ 10 ans il y a | 2

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