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Stephan


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1,112 2017 年以降の合計貢献数

Knowledge means knowing where it is written...

Interested in:
- Optimization
- Mathematical Modelling
- Improvement of my programming skills

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can anyone tell whre is the error ?
x=-2*pi:0.01:2*pi; y=exp(x); z=sqrt(exp(-x)); figure(3) p=plot(x,y,'r',x,z,'b'); p(1).LineWidth = 2; p(2).LineWidth ...

5日 前 | 0

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How to replace the empty cells in a cell array by a 4-bits string?
load('Key.mat'); Key1 = Key(:); Key1 = reshape(replace(string(char(Key1{:}))," ","0000"),size(Key,1),size(Key,2)); results...

6日 前 | 0

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How to generate a symmetric Toeplitz matrix?
>> toeplitz([-pi 0 pi]) ans = -3.1416 0 3.1416 0 -3.1416 0 3.1416 0 -3.14...

7日 前 | 2

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"syms", "sym", and "mupad" functions cause MATLAB to freeze
R2017b had this bug, but it was fixed in update 7 and following. Try to install the latest update for your release - see Step 2:...

9日 前 | 0

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How to use VPA (variable precision arithmetic) in calculating HH band via dwt on an image?
You can not do this. dwt2 accepts only double as input and outputs double. vpa works on symbolic variables and returns a symboli...

約2ヶ月 前 | 0

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String to Categorical array
x = [zeros(1,120), ones(1,240)]; res = categorical(x, [0, 1], {'Z', 'O'});

約2ヶ月 前 | 0

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Reducing 2nd order ODE into coupled ODE. Solve using Euler Method and graph.
tspan = [0 5]; % time span to integrate y0 = [3 0]; % initial conditions %Start of Euler Method syms y(t) E = diff(y,2) + ...

約2ヶ月 前 | 0

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How to convert cell array to double?
c = {[1 2],[2 3]} s = cell2mat(c) s = unique(s)

約2ヶ月 前 | 0

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hi,i am getting error as not enough input arguments,while i run the below code....?? please let me know that?(the error is in second line of code)
Works fine for me, if called with *_2_* input arguments: res = trio(3,4) function x=trio(m,n) x=rand([3*m n]); ...

約2ヶ月 前 | 0

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How to solve coupled (differential) equations of motion using matlab?
Whta is the problem? There is an analytical solution (here assumed that vx0 and vz0 are equal to 1): syms w b g m x(t) y(t) z(t...

約2ヶ月 前 | 0

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Undefined operator '/' for input arguments of type 'function_handle'
b=400; %mm d=500; %mm Asv = [3000 5000 3000 5000]; %mm^2 fckv = [30 30 90 90]; %Mpa num_fckv = numel(fckv); fsolve_opt...

約2ヶ月 前 | 0

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Can't plot function
x = linspace(0,10); y = sqrt(1+x.^2)./sqrt(x.^4-x.^2+1); plot(x,y)

約2ヶ月 前 | 1

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Fit Powerlaw to Data
https://de.mathworks.com/help/curvefit/custom-nonlinear-models.html

約2ヶ月 前 | 0

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Numerical Solution for a System of Three ODEs with Different Constant for Each Time Element
Use interp1 for this. Here is an example: https://de.mathworks.com/matlabcentral/answers/487412-using-ode45-to-solve-differenti...

約2ヶ月 前 | 0

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Text file manipulation, find specific lines, find there a string and replace the specific line with new content
There is a bunch of possibilities to manipulate strings: https://de.mathworks.com/help/matlab/ref/extractafter.html https://de...

約2ヶ月 前 | 0

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Fitting an equation to a Sine Function with NonLinearModel.fit
"...I already tried using the "cftool" function in matlab but it did not have the equation I need...." Did you notice that yo...

約2ヶ月 前 | 0

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How to replace last 3 digits in a floating point number by another 3 digits
format long x = -3.141592653589793; a = 287; x_new = sprintf('%.15f',x); x_new(end-2:end) = (sprintf('%d',a)); x_new = st...

約2ヶ月 前 | 0

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I am trying to use ODE45, but I keep getting an error with myfcn saying I don't have enough inputs?
There are at least 4 problems in your code: 1. Split your main code and your ode function: tspan = [0 10]; f0 = [0 0]; ...

約2ヶ月 前 | 1

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Having trouble with ODE45 and a System of Ordinary Differential Equations
For every equation you have to input an initial condition. You have 8 but only give 2 initial conditions to ode45. Also your ...

約2ヶ月 前 | 0

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Is there a function to turn ?x2 matrix of coordinates of vertices of a polygon into a ?x4 matrix of coordinates of line segments of that polygon?
Yes, circshift will do the job: A = [2, 4; 5, 6; 6, 6; 8,5] B = [2, 4, 5, 6; 5, 6, 6, 6; 6, 6, 8, 5; 8, 5, 2, 4] % The sol...

約2ヶ月 前 | 0

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could anyone help me to display the values in the matrix which are greater than the average value for the following code
B, C and D are not needed, if you use the inbuilt function mean: A=[3.3734 5.1245 4.3729 2.8406 6.5283 4.8144 ...

約2ヶ月 前 | 0

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How can calcuate the lines of code efficiently?
Yes, you can if you avoid using a loop and vectorize your code - see here: tic %%%code nx=512; ny=nx; dx=1; dy=dx; format...

約2ヶ月 前 | 1

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how can i differentiate a constant in simulink?
You already have done everything exactly correct - Simulink also did what is correct. What is the derivative of y(t)=3 with resp...

約2ヶ月 前 | 0

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Eigenvalues and Eigenvectors of Symbolic Matrix
syms E t H = [E -t -t -t -t 0 0 0 0;-t E 0 0 0 -t -t 0 0;-t 0 E 0 0 0 0 -t -t;... -t 0 0 E 0 -t 0 -t 0; -t 0 0 0 E 0 -t 0...

約2ヶ月 前 | 0

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what is wrong with my script
clear all for loop_index = 1:2 x = input('Input number to convert'); units = input('Input the units to convert from','s...

約2ヶ月 前 | 1

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Any trick to name a variable with decimal number?
No, it is simply not allowed in Matlab. No way, no trick: https://de.mathworks.com/help/matlab/matlab_prog/variable-names.html#...

約2ヶ月 前 | 0

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PULL OUT A SPECIFIC WORD FROM A LONG STRING
You might want to start reading here: https://de.mathworks.com/help/matlab/matlab_prog/searching-and-replacing.html

約2ヶ月 前 | 1

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How do I create a for loop to extract data from table?
No loop is needed: A = unstack(ReactionTime,'RESPONSE_TIME_ehmi','videostring') since you have invalid names for you video fil...

約2ヶ月 前 | 0

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complement of an image
I = fliplr(imread('cameraman.tif')); I1 = triu((I),1); I2 = tril(imcomplement(I)); I_res = fliplr(I1+I2); imshow(I_res) B...

約2ヶ月 前 | 1

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Trapz gives "Second and third argument must either be variables or a variable and a nonnegative integer specifying the number of differentiations."
syms x f_scalar = @(x) 5*x^2+3*x-4; g_scalar = @(x) -4*x^2+6*x+5; f = @(vec) arrayfun(f_scalar,vec); g = @(vec) arrayfun(g_sca...

約2ヶ月 前 | 0

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