Answered
How can I simultaneously solve for these equations?
If you have the symbolic toolbox, a straight forward approach works, although it takes some time ... % ODE propblem syms B...

1 year ago | 0

Answered
Error when using ode15
It is good practice to try and avoid globals, but rather pass them as auxilary variables into the function. Fao = 1487.351; % ...

1 year ago | 0

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Answered
Plotting Step Response of a Differential Equation
You are close to a viable solution. Solve for an analytical solution, then make it a Matlab (anonymous) function with matlabFunc...

1 year ago | 0

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Runge-Kutta 4th order method
First up, you will need a much smaller step size to get an accurate solution using this explicit RK4 (with no error control). I ...

1 year ago | 0

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Answered
How to draw Fig. 1 from the attached pdf with this code
I didn't bother draw the other 3 lines, but you just ned to make the necessary changes to gamma for that. If you run somethi...

1 year ago | 0

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fsurf not drawing cant explain
Do you really need to use the symbolic toolbox? Why not just plot a numerical surface? But you are right, your numbers are widel...

1 year ago | 0

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Fitting Monod Equation with ODE45 to data using lsqcurvefit function
Here's my solution. First set up the measured data, plot it, and look to see that it is all OK. t = [0 3 5 8 9.5 11.5 14 16 ...

1 year ago | 0

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Answered
Solve integrals with Matlab
Do you have the symbolic toolbox? If so, start with the int command. You can do both indefinite and definite integration. sy...

1 year ago | 1

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Answered
MATLAB Help - Rolling Dice Simulation / Central Limit Theorem
A quick hack using randi and cumsum is N = 100 x = randi(6,N,6); cs = cumsum(x')'; for i=1:6 subplot(3,2,i) histogram...

1 year ago | 0

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Answered
How to calculate the accumulated rainfall value of 1, 2, 3, 4, 5, 6 and 7 days.
Here is my solution: I notice that you've got few NaNs for about a year and a half. Your last year is also incomplete. I is...

1 year ago | 0

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Answered
plot x axis as persentage
Below, I've plotted an arbitrary function between arbitrary limits, -5 and +37. %% x = linspace(-5,37)'; y = erf(x/20); ...

1 year ago | 0

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inline function error help(tanh)
I can, but perhaps you should use anonymous functions. The inline approach is now discouraged. Instead of what you wrote above...

1 year ago | 0

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how to plot multiple waves on one surface
Here is a mock up solution. Code is: below. I've used part of your data, but I've made up some similar data (using a sinc fun...

1 year ago | 0

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LaTex with 2 strings separated by a num2str
Use an escape (backslash) for the % errordisplay=[' $\varepsilon_{RTP}=$ ',num2str(rtep),'\%'];

1 year ago | 1

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Solving second order implicit differential equation
Just convert the 2nd order ODE into Cauchy form. You will of course need 2 initial condtions. Define x, now you original equat...

1 year ago | 0

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Stimulating Chemical Reaction with Differential Equation on Simulink
Homework? Anyway, to get you started, take a look at my Simulink layout: I've painted the integrators yellow, and I have expli...

1 year ago | 0

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how do i rotate an airfoil points? and plot.
Does this look better? Some (small) changes to your code. I swapped your rotation direction to better follow your example pl...

1 year ago | 2

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plotting an exponential will a matrix over time
OK, your question is a bit vauge, and there are missing bits, i.e. the start point for y. I'm assuming you are trying to solve...

1 year ago | 0

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finding lengths of an ellipse
If you need a little more help, then it pays to plot the ellipse and look at the arc lengths. t = linspace(0,2*pi)'; x = @(t)...

1 year ago | 0

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Answered
I want to know how i can apply k-means clustering on my scatter plotted dataset.
You probably want to use kmeans. Since you didn't give us any data to workj with, nor did you give us any idea of the number o...

1 year ago | 1

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Answered
Fitting model to titration data
For one thing, you don't assign an answer to function sseval. That's not going to help things. Here's my solution: I've re...

1 year ago | 1

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Position of two subplots with bar charts
One option is to obtain the position of the plot with the long legend, and then re-size the other to the same width. But it's pr...

1 year ago | 0

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Histogram x axis tick labels – string
Try >> get(gca,'XTicklabel') and hack that.

1 year ago | 1

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Answered
Histogram x axis tick labels – string
Released 2016b. What's your version? >> which xticklabels C:\Program Files\MATLAB\R2018b\toolbox\matlab\graph3d\xticklabels.m...

1 year ago | 0

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Histogram x axis tick labels – string
Hack the final xticklabel x = randn(1e5,1); x= x-min(x)+1; histogram(log(x)) xlim([0,3]) xt = xticklabels; xt{end} = 'oth...

1 year ago | 1

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solving a very complicated equation implicitly
A quick answer is you probably need to dot-divide (./) the term with the (vector) rpf. 2nd point. Because I used a root finder...

1 year ago | 0

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Y-axis labels overlaps with figure when using a reversed x-axis
Ah, missed that. Nasty bug/feature. text(10,10.5e9,'x10^9') % place manually ?

1 year ago | 0

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Y-axis labels overlaps with figure when using a reversed x-axis
Yes, it seems to only happen when there is an exponent in the y-axis. And even then the exponent must have double figures. Also ...

1 year ago | 0

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solving a very complicated equation implicitly
OK, try this: My approach was to embed an integral inside a root solver. I basically used your code and coefficients, but chan...

1 year ago | 1

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How can I find the coefficients of a second order ODE using data points?
You will also need to have collected x(t) at each sample point.

1 year ago | 0

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