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I would like to make surface plot of my probability of failure curve?
clear all; mue=0.82; %mean of unbiased factor of study case sige=0.189; %SD of unb...

4 years ago | 0

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How can I put a loop here?
V = [0.5 1 2 3 4 6 10].'; del = 0:1:90; del_r = del.*pi./180; x = V.*tan(del_r); del_r2 = atan(x); del2 = del_r2*180./pi;...

4 years ago | 0

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Answered
WATERMODEL returns a vector of length 825, but the length of initial conditions vector is 3. The vector returned by WATERMODEL and the initial conditions vector must have the
% Load file with variables temperature, ET etc, %% data=readtable("https://de.mathworks.com/matlabcentral/answers/uploaded_fil...

4 years ago | 0

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can any one tell me why this error has occurred.
i is a vector (at least when the loop index LL is 2, for LL = 1 i is taken as the imaginary unit because it's not yet defined), ...

4 years ago | 0

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Answered
How can I use fzero on these two functions?
Use the original equation. Why do you take log on both sides - it only implies problems for x <= 3/4. f = @(x)4*x-3-exp(-0.1*x)...

4 years ago | 0

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how do i get the the fifth and fourth number form behind?
x = [2361273621, 2937812378, 2367823827]; b = arrayfun(@(a)num2str(a),x,'uni',0); b = arrayfun(@(i)b{i}(end-4:end-3),1:length(...

4 years ago | 0

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Plotting using MATLAB problem
https://www.youtube.com/watch?v=GrpDgOjR5ZA

4 years ago | 0

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How can i put a stopping criterion for this bisection method code in matlab?
f_x= @(x)sin(5*x)+cos(2*x); p_old = 0; % give an initial value to it x_l =2; x_u = 10; x=x_l:0.01:x_u; hold on plot(x,f...

4 years ago | 0

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Is there any mathematical method of curve fitting for cases when the modeling function is unknown (another degree of freedom for the form of the function)?
No, there is no such method. Often, physical considerations are a way to decide for a suitable model function. If this is not ...

4 years ago | 0

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How to generate a random number that is either 100, 200, or 300.
Hint: 100*1 = 100 100*2 = 200 100*3 = 300

4 years ago | 0

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writing the equation of normalize correlation
rng('default') x = 4; y = 5; w = rand(x,y); wstroke = rand(x,y); NC = sum(w.*wstroke,'all')/sum(w.^2,'all')

4 years ago | 0

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Answered
Nonlinear optimization not working
fun = @(x,y,z) 25*x + 37*y + 48*z; x0 = [0,0,0]; A = [0 -1 2]; b = [0]; Aeq = []; beq = []; lb = [200 200 200]; ub = [...

4 years ago | 0

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Answered
Getting NaN greater values in a function
warning('off') iterations = [10, 100, 1000]; count = 1; p = 0.5; for n = iterations figure(); hold on; for ...

4 years ago | 0

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How to solve 2nd order multiple variable equation with ode45
syms t y1(t) y2(t) syms c2 m1 m2 k1 k2 F eqn1 = diff(y1,t,2) + c2/m1*(diff(y1,t)-diff(y2,t))+k1/m1*y1+k2/m1*(y1-y2)-F == 0; e...

4 years ago | 0

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The plot of a given equation
h=0:0.01:2; Fmax = 37509.41*sqrt(h); plot(h,Fmax)

4 years ago | 0

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Answered
how to split a 4x3 matrix in half
If the number of columns of arr1 is divisible by 2: arr1 = [1 2 3 4;5 6 7 8;9 10 11 12]; arr1_half = arr1(:,1:size(arr1,2)/2)

4 years ago | 0

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how to write equation in matlab for E(t-tp) where the E is E(t) but introduce a tp delay time.
You will need to make a change in the unit of time in your equations such that the delay time is in the order of 1 - it's not p...

4 years ago | 1

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Answered
Provide Jacobian matrix to ode15i for solving DAE system
y0 = [1; 0; 0]; yp0 = [0; 0; 0]; options = odeset('RelTol',1e-4,'AbsTol',[1e-6 1e-10 1e-6], 'Jacobian', @Jac_robertsidae); [y...

4 years ago | 1

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Answered
Define a variable on a spline
n = 3; n1 = n-1; a = 20; b = 10; P = [0 b;0 0;a 0]; x = P(:,1); y = P(:,2); T ...

4 years ago | 1

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bisection method error symbolic
syms y q=20; g=9.8; b=3+y; ac=3*y+y^2/2; f= 1-q^2/(g*ac^3)*b; x1=0.5; xu=2.5; hold on fplot(f,[0.5 2.5]) grid on f =...

4 years ago | 0

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Answered
Bvp4c Unable to solve the collocation equations -- a singular Jacobian Encountered
clc; p = 0.01; Betaf = 207; Betas = 17; Beta = 0.5; kof = 0.613; kos = 400; m = 1; b2 = 0.5; b1 = 0.5; G1 = 5; G2 = 5...

4 years ago | 0

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Answered
Third for loop runs, second and third loops do not
If val_T were 1, only the third loop was entered. But we don't know the value of val_T.

4 years ago | 0

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Answered
Using euler's method to plot x(t) graph
You pass "ICs(z)" and "timeVector" to "eulersub". In the function, they get the names a and b. But a and b are never referenced ...

4 years ago | 0

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Answered
How to solve this without syms x
fun = @(x) x.^2./(1+sqrt(x)) ; sol = fzero(@(x)fun(x)-2,10); x = 0:0.1:4; plot(x,fun(x),sol,fun(sol),'o')

4 years ago | 0

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Answered
My code is outputting very illogical answers for the second block (my second vector loop equation).
% given values R1 = 59.7; R2 = 18.8; R3 = 41.0; R4 = 40.1; R5 = 136.4; R6 = 11.9; R7 = 15.6; R8 = 11.7; Rgi = 13.1; Re...

4 years ago | 0

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Graph not being displayed
./ instead of simple / : x=linspace(-5,5,130); y=(2*x.^2-2*x-1)./(x.^4+1); plot(x,y);

4 years ago | 0

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Answered
Euler Integration Step Size Change
Only integer values can be used for array indexing. The loop must run from i=1 to i=5000 instead.

4 years ago | 0

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How can i plot dy/dx function?
xspan = (30:0.1:900); y0 = 0; options = odeset('RelTol',1e-12,'AbsTol',1e-12); [x,y] = ode15s(@(x,y) odefun(x,y), xspan, y0, ...

4 years ago | 0

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What is wrong with the function code when it can work perfectly without function code
Works for me. [k,p,err,P] = fixpt(@(x) sin(x)-1,-1,0.00001,100) function [k,p,err,P] = fixpt(g,po,tol,maxi) % g is the functi...

4 years ago | 0

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Error tolerance in matlab
The ode integrators try to guarantee a predefined error tolerance when solving your system of ordinary differential equations. I...

4 years ago | 0