Andrew Newell

Last seen: meer dan een jaar 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...

ongeveer 3 jaar 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...

ongeveer 3 jaar 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

ongeveer 3 jaar 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...

ongeveer 3 jaar ago | 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...

ongeveer 4 jaar ago | 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...

meer dan 6 jaar 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...

bijna 7 jaar ago | 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...

bijna 7 jaar 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...

bijna 7 jaar ago | 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...

bijna 7 jaar ago | 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 ...

bijna 7 jaar 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...

bijna 7 jaar 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-...

ongeveer 7 jaar 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);

ongeveer 7 jaar ago | 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|), ...

ongeveer 7 jaar 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;...

ongeveer 7 jaar ago | 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...

ongeveer 7 jaar ago | 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...

ongeveer 7 jaar 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.

ongeveer 7 jaar ago | 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) =...

ongeveer 7 jaar 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...

ongeveer 7 jaar 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...

ongeveer 7 jaar 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...

ongeveer 7 jaar ago | 1

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Answered
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,:); ...

ongeveer 7 jaar ago | 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...

ongeveer 7 jaar 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...

ongeveer 7 jaar 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...

ongeveer 7 jaar 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 ...

ongeveer 7 jaar 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...

ongeveer 7 jaar 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|.

ongeveer 7 jaar ago | 2

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Andrew Newell

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