Answered

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 ...

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 ...

17 Tage ago | 0

| accepted

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...

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...

23 Tage ago | 0

| accepted

Answered

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...

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...

24 Tage ago | 0

Answered

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 ...

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 ...

etwa ein Monat ago | 0

| accepted

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...

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...

etwa ein Monat ago | 1

| accepted

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...

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...

etwa ein Monat ago | 0

| accepted

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...

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...

etwa ein Monat ago | 0

| accepted

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); ...

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); ...

etwa ein Monat ago | 0

Answered

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...

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...

etwa ein Monat ago | 0

Answered

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...

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...

etwa ein Monat ago | 0

Answered

LaTex with 2 strings separated by a num2str

Use an escape (backslash) for the % errordisplay=[' $\varepsilon_{RTP}=$ ',num2str(rtep),'\%'];

LaTex with 2 strings separated by a num2str

Use an escape (backslash) for the % errordisplay=[' $\varepsilon_{RTP}=$ ',num2str(rtep),'\%'];

etwa ein Monat ago | 1

Answered

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...

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...

etwa ein Monat ago | 0

| accepted

Answered

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...

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...

etwa ein Monat ago | 0

Answered

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...

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...

etwa ein Monat ago | 2

| accepted

Answered

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...

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...

etwa ein Monat ago | 0

Answered

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)...

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)...

etwa ein Monat ago | 0

| accepted

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...

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...

etwa ein Monat ago | 1

| accepted

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...

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...

etwa ein Monat ago | 1

Answered

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...

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...

etwa ein Monat ago | 0

Answered

Histogram x axis tick labels – string

Try >> get(gca,'XTicklabel') and hack that.

Histogram x axis tick labels – string

Try >> get(gca,'XTicklabel') and hack that.

etwa ein Monat ago | 1

| accepted

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...

Histogram x axis tick labels – string

Released 2016b. What's your version? >> which xticklabels C:\Program Files\MATLAB\R2018b\toolbox\matlab\graph3d\xticklabels.m...

etwa ein Monat ago | 0

Answered

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...

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...

etwa ein Monat ago | 1

Answered

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...

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...

etwa ein Monat ago | 0

Answered

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 ?

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 ?

etwa ein Monat ago | 0

Answered

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 ...

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 ...

etwa ein Monat ago | 0

Answered

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...

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...

etwa ein Monat ago | 1

Answered

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.

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.

etwa ein Monat ago | 0

Answered

to find the root of quantum transcendental equation

Well you have given us quite a puzzler; little background info and no context. I'm assuming you are looking for the value Ee s...

to find the root of quantum transcendental equation

Well you have given us quite a puzzler; little background info and no context. I'm assuming you are looking for the value Ee s...

etwa ein Monat ago | 0

Answered

How to get a kernel density plot

You also can use ksdensity from the Stats toolbox. But you have supplied us with a matrix with 25 columns! Which column were you...

How to get a kernel density plot

You also can use ksdensity from the Stats toolbox. But you have supplied us with a matrix with 25 columns! Which column were you...

etwa ein Monat ago | 0

| accepted

Answered

Coefficents not reflecting the curve obtained using fit function

I suspect that the problem is that you have normalised the data, and then forgot that when you looked at the parameter values. ...

Coefficents not reflecting the curve obtained using fit function

I suspect that the problem is that you have normalised the data, and then forgot that when you looked at the parameter values. ...

etwa ein Monat ago | 0

| accepted