Andrew Newell

Last seen: mer än ett år ago | Active since 2011

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

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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...

ungefär 3 år ago | 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...

ungefär 3 år ago | 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

ungefär 3 år ago | 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...

ungefär 3 år ago | 0

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Answered
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...

ungefär 4 år ago | 0

Answered
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...

mer än 6 år ago | 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...

nästan 7 år ago | 0

Answered
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...

nästan 7 år ago | 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...

nästan 7 år ago | 0

Answered
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...

nästan 7 år ago | 1

Answered
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 ...

nästan 7 år ago | 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...

nästan 7 år ago | 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-...

nästan 7 år ago | 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);

nästan 7 år ago | 0

Answered
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|), ...

nästan 7 år ago | 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;...

nästan 7 år ago | 1

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Answered
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...

nästan 7 år ago | 0

Answered
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...

ungefär 7 år ago | 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.

ungefär 7 år ago | 0

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

ungefär 7 år ago | 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...

ungefär 7 år ago | 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...

ungefär 7 år ago | 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...

ungefär 7 år ago | 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,:); ...

ungefär 7 år ago | 1

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Answered
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...

ungefär 7 år ago | 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...

ungefär 7 år ago | 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...

ungefär 7 år ago | 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 ...

ungefär 7 år ago | 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...

ungefär 7 år ago | 0

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How do I set the limits on the secondary y axis?
Use <https://www.mathworks.com/help/matlab/ref/ylim.html ylim> right after |yyaxis right|.

ungefär 7 år ago | 2

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Andrew Newell

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