Andrew Newell

Last seen: environ 2 ans il y a | Actif depuis 2011

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A geophysicist who uses MATLAB for most of his modeling. Professional Interests: geophysics

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Using AND Operator in “if” statements
The problem is that size returns a vector: size([1 2 3]) ans = 1 3 Instead, use |numel|: if numel([1 2 3])==numel([4 5 6]) &...

environ 17 heures il y a | 9

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How do I generate a random number with beta distribution?
You can use the function betarnd, but you'll need to do some normalizing to get it in the standard form used by MATLAB (see Beta...

plus de 3 ans il y a | 0

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Newton Raphson - saving all values and using last iteration value as initial for next
Sorry, I just realized that you wanted to save the iterations. Here's how: x = -0.001*ones(6,length(A1)); for i=1:5 x(i+1...

plus de 3 ans il y a | 0

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Newton Raphson - saving all values and using last iteration value as initial for next
O.k. So here is how you do it: x = -0.001*ones(size(A1)); for i=1:5 x = x - f(x)./fd(x); end

plus de 3 ans il y a | 0

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Finding tangent plane with the max range value and z value being equal
Notice that is empty, then try this: X = -1.41:0.01:1.41; [~,idx] = min(abs(X-1)); disp(X(idx)-1) This being floating point...

plus de 3 ans il y a | 0

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MatCont for Homotopy Method
The primary purpose of MatCont (which is a GUI front end for Cl_MatCont) is to analyze solution curves of the form . These may b...

plus de 4 ans il y a | 0

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Coupled Differential Equations - derivatives on both sides of equations
Let's simplify things a little bit so we can better see what is going on. Let Y = [x; y]; G1(t,Y) = 0.000053+g1(Y(1),t...

environ 7 ans il y a | 0

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Why doessn't my code work for compsite simpson one third rule?
You weren't defining the function properly. Try this: func=@(x) 1+exp(-x); See <https://www.mathworks.com/help/matlab/ma...

plus de 7 ans il y a | 0

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how to continue code in next line with comment between them
You can have the comments beside each part instead: a=b+c+f... % line 1 +t+h+k; % line 2 However, it is possib...

plus de 7 ans il y a | 0

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Class Property: Array of Objects
You need to define a get method (see <https://www.mathworks.com/help/matlab/matlab_oop/access-methods-for-dependent-properties.h...

plus de 7 ans il y a | 0

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Series Summation With Function Handles
In principle, you can use |matlabFunction| to get around this difficulty. However, I noticed a couple of issues. First, the summ...

plus de 7 ans il y a | 1

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How to overlay a curve over histogram?
If you already have the curve, then just type |hold on| and plot it. An example: ydata = randn(1000,1); hist(ydata) hold ...

plus de 7 ans il y a | 0

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How to create a new variable for each iteration of a while loop?
Structures are great for this kind of task (see <https://www.mathworks.com/help/matlab/ref/struct.html struct>). Here is an exam...

plus de 7 ans il y a | 1

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How to store multiple serial objects
You certainly can store them in an array, e.g.: n = 8; s = cell(8,1); for ii=1:8 s{ii} = serial(sprintf('COM1%d',ii-...

plus de 7 ans il y a | 1

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How can I fix my error with the passing a function to another fuction?
The first line should be f = @(x) exp(x);

plus de 7 ans il y a | 0

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Integration of norminv function
The problem is that |norminv(x,0,1)| goes to |-Inf| as |x| goes to zero and |Inf| as |x| goes to 1 (and ditto for |y| and |z|), ...

plus de 7 ans il y a | 1

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How to plot a matrix in polar coordinates with color?
I think most approaches will involve converting the coordinates to Cartesian. Here is one approach: v0=10; A=4.*v0./pi;k=1;...

plus de 7 ans il y a | 1

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Nonlinear Tangent (trigonemetric) equation
Before trying to find zeros for a function, it's a good idea to plot it so you understand the nature of the problem. If you do t...

plus de 7 ans il y a | 0

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How to calculate the integral of a function with a spline in it
For evenly or unevenly spaced data, you could use the trapezoidal rule (MATLAB function <https://www.mathworks.com/help/matlab/r...

plus de 7 ans il y a | 0

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Offseting the y axis to make data more clear
After yyaxis right; use a command like ylim([-0.1 1.5]) to move the axes.

plus de 7 ans il y a | 0

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Logical Test on Matrix Failing
The variable |little_endian_message| is a char representation of binary numbers. Try this: if( little_endian_message(a) =...

plus de 7 ans il y a | 0

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Plots with stairs and inclines?
I'm not sure how you intend to generate the points, but for the example plot you gave, |plot| works just fine with an appropriat...

plus de 7 ans il y a | 1

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Quiver Plot Arrows too Wide
Have you tried looking at <https://www.mathworks.com/help/matlab/ref/quiver.html the documentation for quiver>? There is an opti...

plus de 7 ans il y a | 0

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Collection many vectors in one matrix
The answer is G = [I1; I2; I3]; See <https://www.mathworks.com/help/matlab/math/creating-and-co%E2%80%A6 Creating and Co...

plus de 7 ans il y a | 1

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How can I speed my function?
One source of delays can be |repmat|. This can be replaced by a suitable choice of index, as in the following: r = R(i,:); ...

plus de 7 ans il y a | 1

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Overwriting While-loop conditional with +Inf
MATLAB evaluates a logical expression like your |while| condition from left to right. If |a==1|, it knows the expression is fals...

plus de 7 ans il y a | 0

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How to Simplify an symbolic expression
If I define a= 2*atan((-2+sqrt(4-gama^2 *l^2* M^2-4* gama *l* M^2 *tan(gama/2)+4* tan(gama/2)^2-4 *M^2 *tan(gama/2)^2))/(ga...

plus de 7 ans il y a | 0

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How to load *.mat file from each directories in new script?
Here is a solution that assumes there is one of these |.mat| files in every subdirectory of each of the 15 directories. Let's al...

plus de 7 ans il y a | 0

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Old form of legend('string 1','string 2',2) ??
Actually, it's NW (see the <http://www.mathworks.com/help/releases/R13sp2/techdoc/ref/legend.html?s_tid=srchtitle documentation ...

plus de 7 ans il y a | 1

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Finding normals to contours on contour plot
You want curves to follow the gradients. It's easy enough to <https://www.mathworks.com/help/matlab/creating_plots/display-quive...

plus de 7 ans il y a | 0

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