Answered

Passing parameters in boundary value problem using BVP4C

See here: <https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html |*passing extra parameters*|>. I suggest to eith...

Passing parameters in boundary value problem using BVP4C

See here: <https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html |*passing extra parameters*|>. I suggest to eith...

8 días ago | 0

Answered

How to extract frames from a .mp4 video?

outputFolder1=('video'); v1=VideoReader('Clock.mp4'); vid1Frames=read(v1); for frame=1:size(vid1Frames,4) outputBaseFileNa...

How to extract frames from a .mp4 video?

outputFolder1=('video'); v1=VideoReader('Clock.mp4'); vid1Frames=read(v1); for frame=1:size(vid1Frames,4) outputBaseFileNa...

8 días ago | 0

Answered

Plot pixels from 2D boolean array

% your array A = randi(2,101)-1; % the result; R=255*ones(101); G=255*(-A+1); B=255*(-A+1); res = cat(3,R,G,B); ...

Plot pixels from 2D boolean array

% your array A = randi(2,101)-1; % the result; R=255*ones(101); G=255*(-A+1); B=255*(-A+1); res = cat(3,R,G,B); ...

9 días ago | 0

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Answered

Return a value from a table

Quarter = {'Q12019'; 'Q22019'; 'Q32019'; 'Q42019'; 'Q12020'; 'Q22020'; 'Q32020'; 'Q42020'}; QuarterStartDate = ['2019-01-01'; '...

Return a value from a table

Quarter = {'Q12019'; 'Q22019'; 'Q32019'; 'Q42019'; 'Q12020'; 'Q22020'; 'Q32020'; 'Q42020'}; QuarterStartDate = ['2019-01-01'; '...

9 días ago | 1

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Answered

Inserting vertical and horizontal line in bodeplot

xline and yline should work for this purpose. Both functions were introduced with R2018b. If you use an earlier release, just de...

Inserting vertical and horizontal line in bodeplot

xline and yline should work for this purpose. Both functions were introduced with R2018b. If you use an earlier release, just de...

9 días ago | 1

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Answered

Solving EOM coupled equations using ode45

syms x(t) y(t) eq(1)=diff(y,t,2)==(3/2)*(9.81*sin(y)-diff(x,t,2)*cos(y)); eq(2)=11*diff(x,t,2)+(1/2)*cos(y)*diff(y,t,2)-(1/2...

Solving EOM coupled equations using ode45

syms x(t) y(t) eq(1)=diff(y,t,2)==(3/2)*(9.81*sin(y)-diff(x,t,2)*cos(y)); eq(2)=11*diff(x,t,2)+(1/2)*cos(y)*diff(y,t,2)-(1/2...

9 días ago | 1

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Answered

Array indices must be positive integers or logical values. Error in (line 8) mr(t)=mi-((mi-mf)*(t./tb));

I doubt you want t to have only one point. Also no for loop is needed: mi=2290000; mf=130000; tb=165; t=linspace(6.5,165...

Array indices must be positive integers or logical values. Error in (line 8) mr(t)=mi-((mi-mf)*(t./tb));

I doubt you want t to have only one point. Also no for loop is needed: mi=2290000; mf=130000; tb=165; t=linspace(6.5,165...

10 días ago | 1

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Answered

could anyone help me how to combine data in two columns

Res = [A B]

could anyone help me how to combine data in two columns

Res = [A B]

10 días ago | 0

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Answered

Not able to use ode45 to solve and plot solution to vdp equation

You are missing some things. Looks like a mix of numeric and symbolic calculations, which won't work. But tou have luck - exactl...

Not able to use ode45 to solve and plot solution to vdp equation

You are missing some things. Looks like a mix of numeric and symbolic calculations, which won't work. But tou have luck - exactl...

11 días ago | 0

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Answered

How to divide column vector elements in unequal parts against a condition?

Due to different lengths of your daily data you should use a cell array: A = readmatrix('New Text Document.txt'); k_min = mi...

How to divide column vector elements in unequal parts against a condition?

Due to different lengths of your daily data you should use a cell array: A = readmatrix('New Text Document.txt'); k_min = mi...

11 días ago | 1

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Answered

how to solve inequality in matlab R2016a

In 2019b this works by using an assumption: syms x real eqn = (x-1)*(x-2)*(x-3)*(x-4)> 0; S = solve(eqn, x) % Test solutio...

how to solve inequality in matlab R2016a

In 2019b this works by using an assumption: syms x real eqn = (x-1)*(x-2)*(x-3)*(x-4)> 0; S = solve(eqn, x) % Test solutio...

12 días ago | 0

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Answered

Tspan is not strictly increasing.

Since ode45 uses an automated stepwide control just define the start and the end of your tspan this way: tspan = [0 10]; This ...

Tspan is not strictly increasing.

Since ode45 uses an automated stepwide control just define the start and the end of your tspan this way: tspan = [0 10]; This ...

12 días ago | 0

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Answered

Subplot in ODE45

d = [0.20 0.30 0.50]; for ii = 1:numel(d) sol(ii)=ode45(@(t,C)b2(t,C,d(ii)),[0 2],[130 10 5]); t{:,ii}=sol(ii).x'; ...

Subplot in ODE45

d = [0.20 0.30 0.50]; for ii = 1:numel(d) sol(ii)=ode45(@(t,C)b2(t,C,d(ii)),[0 2],[130 10 5]); t{:,ii}=sol(ii).x'; ...

13 días ago | 1

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Answered

How to print greek letters like 'µ' in fprintf to file handle?

fileID = fopen('testFile.txt','w') fprintf(fileID,['16.0', char(181), 'm']); fclose(fileID)

How to print greek letters like 'µ' in fprintf to file handle?

fileID = fopen('testFile.txt','w') fprintf(fileID,['16.0', char(181), 'm']); fclose(fileID)

13 días ago | 0

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Answered

Differential Equation Problem using ode45

[W,Fa] = PBR_Isothermal; % plot results subplot(3,2,1) plot(W,Fa(:,1)) subplot(3,2,2) plot(W,Fa(:,2)) subplot(3,2,3) pl...

Differential Equation Problem using ode45

[W,Fa] = PBR_Isothermal; % plot results subplot(3,2,1) plot(W,Fa(:,1)) subplot(3,2,2) plot(W,Fa(:,2)) subplot(3,2,3) pl...

14 días ago | 1

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Answered

problem in optimization by MATLAB using genetic algorithm

Change myFitness.m to: function y = myFitness(x) s = x(1) z = x(3) x = x(2) y = ...YOUR EQUATION HERE end also change thi...

problem in optimization by MATLAB using genetic algorithm

Change myFitness.m to: function y = myFitness(x) s = x(1) z = x(3) x = x(2) y = ...YOUR EQUATION HERE end also change thi...

14 días ago | 0

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Answered

optimixation by genetic algorithm using MATLAB

Get rid of the square brackets - Matlab will interpret this as one input argument of a vectorized function. Therefore it throws ...

optimixation by genetic algorithm using MATLAB

Get rid of the square brackets - Matlab will interpret this as one input argument of a vectorized function. Therefore it throws ...

14 días ago | 0

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Answered

Plotting points that pass through y for x,y,z coordinates

Data=[0.345 0.343 0.341 0.339 0.337 %sample x data -0.005 -0.002 -0.00069 0.0015 0.0034 %sample y data 0.284 0....

Plotting points that pass through y for x,y,z coordinates

Data=[0.345 0.343 0.341 0.339 0.337 %sample x data -0.005 -0.002 -0.00069 0.0015 0.0034 %sample y data 0.284 0....

15 días ago | 1

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Answered

Time-dependent parameter for ODE system

use interp1 to achieve this - an example of how to do this is here.

Time-dependent parameter for ODE system

use interp1 to achieve this - an example of how to do this is here.

15 días ago | 0

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Answered

plot a mathmatical function

https://de.mathworks.com/help/matlab/ref/fplot.html

plot a mathmatical function

https://de.mathworks.com/help/matlab/ref/fplot.html

15 días ago | 0

Answered

Intelligent symbolic variable substitution

syms f(x) z(x) fun = f == x^2 + 8*x + 16; % equals (x+4)^2 transform = z == (x+4)^2; subs(fun, rhs(fun), lhs(transform))...

Intelligent symbolic variable substitution

syms f(x) z(x) fun = f == x^2 + 8*x + 16; % equals (x+4)^2 transform = z == (x+4)^2; subs(fun, rhs(fun), lhs(transform))...

17 días ago | 0

Answered

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,...

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,...

20 días ago | 0

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Answered

Find column where one value is NaN

res = find(~isnan(a(1,:)) & isnan(a(2,:))==1)

Find column where one value is NaN

res = find(~isnan(a(1,:)) & isnan(a(2,:))==1)

20 días ago | 0

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Answered

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...

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...

21 días ago | 0

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Answered

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; ...

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; ...

21 días ago | 0

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Answered

How to solve system of 2nd order differential equations using ode45

plot3(t,x(:,1),x(:,3))

How to solve system of 2nd order differential equations using ode45

plot3(t,x(:,1),x(:,3))

23 días ago | 0

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Answered

summing along 3rd dimension every 10 frames

If A is your matrix: B = sum(reshape(A,32,32,10,[]),3);

summing along 3rd dimension every 10 frames

If A is your matrix: B = sum(reshape(A,32,32,10,[]),3);

25 días ago | 0

Answered

wo kann ich das R2018b runter laden, eine Matlablizenz habe ich

<https://de.mathworks.com/downloads/web_downloads/select_release?mode=gwylf>

wo kann ich das R2018b runter laden, eine Matlablizenz habe ich

<https://de.mathworks.com/downloads/web_downloads/select_release?mode=gwylf>

25 días ago | 1

Answered

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))...

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))...

29 días ago | 0

| accepted

Answered

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...

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...

29 días ago | 2

| accepted