Answered

Implicit Boundary Value Problem

Ok, so looks like what you are after is solving a DAE that has BCs at more than one boundary. Docs say it is ode15s and ode23t ...

Implicit Boundary Value Problem

Ok, so looks like what you are after is solving a DAE that has BCs at more than one boundary. Docs say it is ode15s and ode23t ...

17 hours ago | 0

| accepted

Answered

Select mxm matrix from mxn matrix and solve systems of linear equations

Does this help with first problem: https://www.mathworks.com/help/matlab/ref/nchoosek.html Second problem, maybe make tolerance...

Select mxm matrix from mxn matrix and solve systems of linear equations

Does this help with first problem: https://www.mathworks.com/help/matlab/ref/nchoosek.html Second problem, maybe make tolerance...

1 day ago | 0

Answered

Reduce time execution in a real time serial data reading

If instead of a loop, you use a timer (https://www.mathworks.com/help/matlab/matlab_prog/use-a-matlab-timer-object.html), you mi...

Reduce time execution in a real time serial data reading

If instead of a loop, you use a timer (https://www.mathworks.com/help/matlab/matlab_prog/use-a-matlab-timer-object.html), you mi...

1 day ago | 0

Answered

how to generate text file from generated output

fprintf() accepts as 1st argument a file identifier for a file opened with fopen(). fid = fopen("somefile","w") fprintf(fid,...

how to generate text file from generated output

fprintf() accepts as 1st argument a file identifier for a file opened with fopen(). fid = fopen("somefile","w") fprintf(fid,...

1 day ago | 0

Answered

App designer: Enable mouse scroll to change value on slider

Take a look at the UIFigure's following properties: WindowScrollWheelFcn WindowKeyPressFcn WindowKeyReleasedFcn If you need ...

App designer: Enable mouse scroll to change value on slider

Take a look at the UIFigure's following properties: WindowScrollWheelFcn WindowKeyPressFcn WindowKeyReleasedFcn If you need ...

3 days ago | 0

| accepted

Answered

Trying to identify directions of overlapping lines in images, at my wit's end

Have you looked into radon transforms? You might get some "signal" at the 45 and 135 directions for the right image... If these...

Trying to identify directions of overlapping lines in images, at my wit's end

Have you looked into radon transforms? You might get some "signal" at the 45 and 135 directions for the right image... If these...

3 days ago | 1

| accepted

Answered

Comparing terms in a character array

If it is truly a "character array" and you want exact matches only, you can use the findstr() command, which will return empty i...

Comparing terms in a character array

If it is truly a "character array" and you want exact matches only, you can use the findstr() command, which will return empty i...

18 days ago | 0

| accepted

Answered

Web app system command

To the question: Also, an other question just came to my mind: what's the best practice to store permanent data and access them...

Web app system command

To the question: Also, an other question just came to my mind: what's the best practice to store permanent data and access them...

18 days ago | 0

Answered

Getting data from the figure in appdesigner

Here's an example where I used the data cursor's update function itself to collect the coordinates and feed directly into your a...

Getting data from the figure in appdesigner

Here's an example where I used the data cursor's update function itself to collect the coordinates and feed directly into your a...

20 days ago | 1

Answered

reshaping multi dimensional array and central difference method

Based on your example lines, you seem to have the further simplification that your delta x and delta y are uniform (in your exam...

reshaping multi dimensional array and central difference method

Based on your example lines, you seem to have the further simplification that your delta x and delta y are uniform (in your exam...

20 days ago | 1

| accepted

Answered

Filter a table based on date (Error using tabular/dotParenReference (line 95) Unrecognized row name '01/00/0000'.)

The second way is almost right, but when you use () on testtable, you are extracting a subtable, rather than the datetime array ...

Filter a table based on date (Error using tabular/dotParenReference (line 95) Unrecognized row name '01/00/0000'.)

The second way is almost right, but when you use () on testtable, you are extracting a subtable, rather than the datetime array ...

20 days ago | 1

| accepted

Answered

Using a image variable from one GUI function to another in AppDesigner

Create a property for your app class to hold the image. You appear to be using appdsigner. In appdesigner's code view, on the l...

Using a image variable from one GUI function to another in AppDesigner

Create a property for your app class to hold the image. You appear to be using appdsigner. In appdesigner's code view, on the l...

22 days ago | 1

| accepted

Answered

Plot a curve with its derivatives

As far as I know, matlab's plot function will draw a straight line (linear interpolation) between adjacent points. For your cas...

Plot a curve with its derivatives

As far as I know, matlab's plot function will draw a straight line (linear interpolation) between adjacent points. For your cas...

24 days ago | 0

Answered

Generate matrix of precise length and in ascending order

This seems to work, and is less wasteful RowSum = 10; NCols = 4; NRows = 70000; A = randi(floor((RowSum-2)/(NCols-2)),[NRo...

Generate matrix of precise length and in ascending order

This seems to work, and is less wasteful RowSum = 10; NCols = 4; NRows = 70000; A = randi(floor((RowSum-2)/(NCols-2)),[NRo...

25 days ago | 0

Answered

How do i create a multi-colour histogram using excel data?

I suspect your yA, yB, yC are column vectors, which you are trying to horizontally concatenate with scalars. You can probably fi...

How do i create a multi-colour histogram using excel data?

I suspect your yA, yB, yC are column vectors, which you are trying to horizontally concatenate with scalars. You can probably fi...

25 days ago | 0

Answered

How plot a figure like this attached figure?

It's because mesh expects z-data to be actual coordinates in z, but mesh (and surf) will accept a 4th argument for color N = 50...

How plot a figure like this attached figure?

It's because mesh expects z-data to be actual coordinates in z, but mesh (and surf) will accept a 4th argument for color N = 50...

26 days ago | 0

| accepted

Answered

Painters renderer results in jagged edges

What happens if you set "FaceColor" to "interp" (default is "flat") on the surf object? It fixes the jagge edge for me (2017a or...

Painters renderer results in jagged edges

What happens if you set "FaceColor" to "interp" (default is "flat") on the surf object? It fixes the jagge edge for me (2017a or...

1 month ago | 1

| accepted

Answered

Solve system of boundary value problem (a singular Jacobian encountered)

If you know the problem is solvable (HW, e.g.,), then singular Jacobian usually means something is wrong with your equations or ...

Solve system of boundary value problem (a singular Jacobian encountered)

If you know the problem is solvable (HW, e.g.,), then singular Jacobian usually means something is wrong with your equations or ...

1 month ago | 0

Answered

determining order of accuracy

This is not a matlab question but a numerical analysis problem. Since someone already generated the results for you, it's a matt...

determining order of accuracy

This is not a matlab question but a numerical analysis problem. Since someone already generated the results for you, it's a matt...

1 month ago | 0

| accepted

Answered

Branching a WindowButtonDown function

If you don't mind using undocumented features, I have had success using the standard axes() object instead of uiaxes(), because ...

Branching a WindowButtonDown function

If you don't mind using undocumented features, I have had success using the standard axes() object instead of uiaxes(), because ...

1 month ago | 0

| accepted

Answered

Proper reading of .txt

Just use readtable()? Looks like every station will have already-aggregated results (hourly vs daily for the same station, same ...

Proper reading of .txt

Just use readtable()? Looks like every station will have already-aggregated results (hourly vs daily for the same station, same ...

1 month ago | 0

| accepted

Answered

ODE solver: how to integrate a system with a vector of parameters?

Are you just looking for solving the ODE as many times as you have different values of V? t = [0 400]; y = [0.004 0 0]; alpha...

ODE solver: how to integrate a system with a vector of parameters?

Are you just looking for solving the ODE as many times as you have different values of V? t = [0 400]; y = [0.004 0 0]; alpha...

1 month ago | 0

| accepted

Answered

Limiting mouseclick event to current Axes in App Designer

Cameron's idea of calculating the axes position within the figure position should work, and it is the only way with currently do...

Limiting mouseclick event to current Axes in App Designer

Cameron's idea of calculating the axes position within the figure position should work, and it is the only way with currently do...

1 month ago | 0

Answered

How to access left bottom pixel in image using (0,0)?

If you just want to translate the unflipped image's row index to be translated into a different index as if you were indexing th...

How to access left bottom pixel in image using (0,0)?

If you just want to translate the unflipped image's row index to be translated into a different index as if you were indexing th...

1 month ago | 0

Answered

How to access left bottom pixel in image using (0,0)?

Since you seem to want to "index" by (0,0), perhaps what you are looking for is assigning real (x,y) coordinates to the image an...

How to access left bottom pixel in image using (0,0)?

Since you seem to want to "index" by (0,0), perhaps what you are looking for is assigning real (x,y) coordinates to the image an...

1 month ago | 0

Answered

How to access left bottom pixel in image using (0,0)?

How about if you flip the image? % if the image is in I I = flipud(I)

How to access left bottom pixel in image using (0,0)?

How about if you flip the image? % if the image is in I I = flipud(I)

1 month ago | 0

Answered

how make the plot continuous ?

If I understand correctly, you want the "plot" command to produce a vertical "line" at x=6. To do this, you could duplicate the ...

how make the plot continuous ?

If I understand correctly, you want the "plot" command to produce a vertical "line" at x=6. To do this, you could duplicate the ...

1 month ago | 0

| accepted

Answered

this code is taking a lot of time to run,

If all the files have the same format, I have seen big improvements using detectImportOptions() on the first file re-use those o...

this code is taking a lot of time to run,

If all the files have the same format, I have seen big improvements using detectImportOptions() on the first file re-use those o...

1 month ago | 0

| accepted

Answered

Background Color of UIAxes

It is possible to create a regular "axes" within a "uifigure". Can you try that and see if you can accomplish what you need? Thi...

Background Color of UIAxes

It is possible to create a regular "axes" within a "uifigure". Can you try that and see if you can accomplish what you need? Thi...

2 months ago | 0