Andrew Newell

Last seen: etwa 2 Jahre vor | Aktiv seit 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]) &...

ein Tag vor | 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...

mehr als 3 Jahre vor | 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...

mehr als 3 Jahre vor | 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

mehr als 3 Jahre vor | 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...

mehr als 3 Jahre vor | 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...

mehr als 4 Jahre vor | 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...

etwa 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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 ...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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-...

mehr als 7 Jahre vor | 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);

mehr als 7 Jahre vor | 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|), ...

mehr als 7 Jahre vor | 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;...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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.

mehr als 7 Jahre vor | 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) =...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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,:); ...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 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 ...

mehr als 7 Jahre vor | 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...

mehr als 7 Jahre vor | 0

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