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Stephan


1,057 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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Use Splitapply to write multiple files
Here is a small example of how it could work: % some data to play with Gender = ['m' 'm' 'w' 'w' 'm' 'w']'; Age = randi(60,6,...

約20時間 前 | 0

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Find column where one value is NaN
res = find(~isnan(a(1,:)) & isnan(a(2,:))==1)

1日 前 | 0

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Solving 2 Trigonometric Equation with 2 Unknowns
You can solve the whole system numeric by using *|fsolve|*: [sol,res]=runfun function [sol,res] = runfun px=387.4162; py...

2日 前 | 0

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Solving a differential equation
Hi there were some bugs in this code - see my comments V1=3; Gin=216; alpha=0.5; t1=6; V3=10; tau2=50; Eg=180; tau1=5; ...

2日 前 | 0

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How to solve system of 2nd order differential equations using ode45
plot3(t,x(:,1),x(:,3))

4日 前 | 0

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summing along 3rd dimension every 10 frames
If A is your matrix: B = sum(reshape(A,32,32,10,[]),3);

6日 前 | 0

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wo kann ich das R2018b runter laden, eine Matlablizenz habe ich
<https://de.mathworks.com/downloads/web_downloads/select_release?mode=gwylf>

6日 前 | 1

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Why does this for loop fail?
|vpasolve| may find more than one solution. Try to save your results in a cell array: ... Vrange = cell(1, length(Trange))...

10日 前 | 0

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How to use fsolve with a variable parameter?
Define the values fot T21 that you want to calculate for. Then use a for loop and call your function inside the loop as often as...

10日 前 | 2

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How to extract diagonal line data from image
The result for every line object contains an information about the angle of the line. This information can be used as input to <...

10日 前 | 0

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logspace equivalent and sin(x) [solved]
x = 10.^(1:3) % x=logspace(1, 3, 3) result = sum(A>0.5) % Number of elements in A bigger than 0.5

10日 前 | 1

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coding error ode45
If possible try to avoid global variables: %define parameters %x is the number of cancer cells x0 = 1000; % c2 is the number...

10日 前 | 0

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Remove noise from screw image
Replace the medfilt2 by a gaussian blur using imgaussfilt: %% read image and find points that should lie on a straight line A ...

10日 前 | 1

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Detect orientation of screw image
Using this script lets you know which angle to rotate. Then use this information to rotate the image and check the orientation a...

10日 前 | 1

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Multiple output values on an if else loop
in every run of your loop you overwrite WeightF. Use indexing to avoid this: WeightF(i) = ... also using i for loop count is n...

10日 前 | 0

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Create a matrix that stores rows that are not from a random sample
A way smarter is using the ismember function - here is an example - all you need ist the last line, the first two lines are just...

10日 前 | 0

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how to Conversion transfer function to state space ...MIMO help me
<https://de.mathworks.com/help/control/ref/ss.html?s_tid=doc_ta#f4-373013 Convert Transfer Function to State-Space Model>

18日 前 | 0

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Ode45 change of a value in the equations
Do 2 calls of ode45. The first from tspan=[0 365]. Then use the final result from this as initial condition for the second call ...

21日 前 | 0

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how can i code energy balance eq in matlab
There is an analytical solution found by dsolve: syms T_Co(t) T_Ho(t) M_C M_H T_Ci T_Hi rho_C rho_H V_C V_H UA_i C_Pmc C_Pmh ...

22日 前 | 1

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Reading file with pilcrow (paragraph) sign
This should help: >> A = '09.10.2019¶' A = '09.10.2019¶' >> A(end) = [] A = '09.10.2019' also maybe hel...

22日 前 | 1

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Coupled differential equation to solve fluids
syms x(t) y(t) x0_t x1_t x2_t y0_t y1_t y2_t r0 r1 r2 f1 = x0_t == (-3+0.2*sin(0.2*t)); f2 = x1_t == (3+0.1*sin(0.1*t)); f3 =...

22日 前 | 1

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Solve overspecified equation system
If you have symbolic toolbox, use: % This part builds a system to solve with fsolve syms u1 u2 up2 l1 l2 xa ya xpa ypa ap0 x ...

23日 前 | 0

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Iterate between fixed numbers in an array and store into a matrix.
I suggest to reshape the array to have 250 rows. The most Matlab functions like mean, max, min, sum... work on the columns of an...

23日 前 | 0

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solving an eqn matlab
Another try, after reading a little bit about dde's: [t,y] = delayed; % plot results subplot(3,1,1) plot(t,y(1,:),'LineWid...

24日 前 | 0

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What is the version of Computer Vision Toolbox with Matlab R2019b?
MATLAB Version: 9.7.0.1216025 (R2019b) Update 1 MATLAB License Number: ********** Operating System: Microsoft Windows 10 Home ...

26日 前 | 1

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Using Ode45 to solve differential equation with time dependent variable
% call the nested function [t,dTempdt] = my_assignment; % plot the results plot(t,dTempdt) function [t,dTempdt] = my_assig...

26日 前 | 0

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DOUBLE cannot convert the input expression into a double array.
During the first run of your loop U=0.0, which can be converted to double in line 144 and stored in SF(1). But in the second run...

26日 前 | 0

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How to get double array from string
>> A = str2num('[1,2,3:6,9,12:15]') A = 1 2 3 4 5 6 9 12 13 14 15

26日 前 | 0

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subplot of trigonometric function
A = @(x) sin(x); subplot(3,1,1) fplot(A,[1 50]) B = @(x) cos(x); subplot(3,1,2) fplot(B,[1 50]) C = @(x) tan(x); subplot(...

27日 前 | 0

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Trouble with Nested Function - So I am trying to have 'equation1' return the outputs [G, H, K, C] but it doesn't recognize them... why? Any help is appreciated
% Variables to play with L1 = 1; L2 = 3; L3 = 4; L4 = 2.6 theta1 = 15; theta2 = 47.5; omega = 66; % Call your function...

27日 前 | 0

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