Answered
How to insert the mean in a plot?
If you signal data is in vector y, say, then ymean = mean(y); ystddev = std(y); yhi = ymean+ystdev; ylo = ymean-ystdev; xr...

5 years ago | 1

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plotting the data on land only
Replace the values less than zero by NaNs, then use the surf command. Something like the following perhaps: ix = WH<0; WH(ix)...

5 years ago | 0

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ellipse fitting with matlab using fittype
Have a look here: https://uk.mathworks.com/help/curvefit/fittype.html?s_tid=srchtitle It shows you how to construct your own fu...

5 years ago | 1

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Help plotting a curve according to specific conditions of a variable
You mean like this? theta = linspace(0, 2*pi, 360); theta1=theta; theta1(180:end) = -theta(180:end); plot(rad2deg(theta), ra...

5 years ago | 0

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Answered
Histogram to a CDF/PDF
You can get a CDF as follows: % Modified Kaplan-Meier CDF % assumes each point is representative of 1/N of the population. ...

5 years ago | 0

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How to convert continuous variable into discrete variables?
How about this load('DATA.mat'); X3(1) = []; % the first values for X3 and Y are NaNs, so they are removed here Y(1) = []; ...

5 years ago | 0

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How to stop my iteration Tn(j,i)=Tn+1(j,i)
Replace your for loop by: tol = 10^-6; % Or whatever is appropriate err = 1; while err>tol Told = T; for i=2:nx-...

5 years ago | 0

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Answered
How to find the vaule of a 2-D plot at certain point
Use interp1 to interpolate between known values. Of course you can't guarantee exact values unless you know the exact form of t...

5 years ago | 0

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Splitting a position vector into X & Y then plotting them
Soething like this (needs your data to get a sensible solution): m = 1; rho = 1; Cd = 1; S = 1; g = 9.8; % Replace with your va...

5 years ago | 0

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Answered
Two vectors into matrix with an opeartion?
Like this: a = [0 1 2 3]; b = [6; 7; 8; 9]; % Note that b is a column vector and a is a row vector A = repmat(a,4,1) A = ...

5 years ago | 0

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Answered
How do I use muller method for solving multivariable equations?
I guess there are a few options. If you have the Opimisation toolbox, use fsolve. In your second equation replace V^2 + W^2 b...

5 years ago | 0

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Amplifier Model with Varying Input Amplitude
To plot the x-axis in MHz: plot(xaxis*10^-6, X_mag1); For dB you need 20*log10(... as log is base e, log10 is base 10. I ...

5 years ago | 0

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Storing values from a for loop
Something like ... k = 0; for h0= -2:0.04:1; k = k+1; h=ones(size(x))*h0;Int=pchip(x,y);xx=linspace(x(1),x(end),500); yy=y...

5 years ago | 0

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Answered
trapz or integral which one is more accurate?
integral is more accurate here. Try x = linspace(0,100,1000); and you will find the trapz result reduces to get much closer t...

5 years ago | 1

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Answered
How to use fsolve with input from an array
Presumably you want to find x(1) and x(2) given values for y(1) and y(2). If so, then you can simply solve them as follows: t ...

5 years ago | 0

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I want these kinetic models to fit in MATLAB but I don't know how to proceed. I am in real worry. If anyone can solve/code, it would be of great help. Thanks a million!!
You need to define Haldane as follows (your text-book expression is misleading) Haldane = @(S) 0.478*S / ((1.137 + S) .* (1 + (...

5 years ago | 0

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Answered
Solve numerical equation with Y at both sides
Your equation can also be expressed as a quadratic in Y which could be solved using roots (for specified values of x). You...

5 years ago | 1

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Plot 3D implicit function
This is because your function is never zero with the constants you've used. Try setting c0 = 1.

5 years ago | 0

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How to convert continuous variable into discrete variables?
Does the following do what you want? X3 = 0:0.05:0.6; Ydiscrete = zeros(length(X3)); for i = 2:length(X3) ix = find(X3(i...

5 years ago | 0

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How to show results of for end values as a vector.
h0 = 0:2; h = h0.*2

5 years ago | 0

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Solving Elliptic Integral Numerically
The method is basically a slight modification of the Newton-Raphson method for finding algebraic roots. In one dimension Newton...

5 years ago | 1

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Solving System of Nonlinear Differential equations
The following structure is what you need (notice that the second order ode is turned into two first order ones); R0 = 1; K0 = ...

5 years ago | 1

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Answered
empty sym error, how to solve
You could use fzero: P10 = -100; P1 = fzero(@fn, P10); function F = fn(P1) g=9.807; p=1000; V1=0; ...

5 years ago | 0

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Solving Elliptic Integral Numerically
The following gets close: % Basic data b=.0304; F=4; E1=200e9; L1=.2; h1=.001; I1=b*h1^3/12; E2=200e9; L2=.1; h2=....

5 years ago | 2

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Answered
Define formulas for ODE input
Here's one way: % d^2A/dy^2 + C*(dA/dy) - C*dB/dy = 0 % dB/dy = 1/C*f(B) % Turn the 2nd order ODE inot two 1st order ones % ...

5 years ago | 0

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Answered
How to find my ode45 equation in specific h
Something like this perhaps: tspan = 0:120; h0=2; [t, h] = ode45(@rate, tspan, h0); tx = interp1(h,t,1); plot(t,h,tx,1,'o'...

5 years ago | 0

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Finite Differences using fsolve for non linear equations
Do you need fsolve at all? Doesn't your blayer function do the solving itself? Couldn't you simply have nx = 10; ny = 10; L ...

5 years ago | 0

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advanced Heatmap plotting question
The following will do it, though there are probably neater ways to do the colouring: load('data.mat') x = Z0(:,1); y = Z0(:,2)...

5 years ago | 0

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I want to plot a line but got a curve
Just t = (0:0.01:0.64)'; a = -9.81*ones(size(t)); plot(t,a) gives a horizontal line.

5 years ago | 0

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fitting data with exponential + linear form
Try starting with the following guesses: a = 6E10, b = 4E-4, c = 0, d = -1.57E12. with explinearfit = fittype( @(a,b,c,d,x)...

5 years ago | 0