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Dave B

MathWorks

Last seen: Today Active since 2020

I am a software engineer at MathWorks. My work focuses on graphics and charting.

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Answered
Undefined function 'trend' for input arguments of type 'double'
If you're trying to use a function you got from elsewhere (e.g. downloaded from file exchange) you likely need to add the direct...

2 days ago | 0

Answered
How do I get my plots and "disp" script to show up after its respective code script has concluded?
What you describe that you want is the behavior I'd expect. I ran your code and got exactly this, but I made a few changes: I a...

2 days ago | 0

Answered
How can I decrease the frame rate of a video?
Each iteration is going as fast as MATLAB can, you can slow it down with pause: videoReader = VideoReader('viplanedeparture.m...

2 days ago | 0

Answered
Turn off auto stretch for 3D plot in app designer
When you have an axes that you made in App Designer, gca won't return your axes. Can you try your set(ax,props,get(ax,props)) ap...

3 days ago | 0

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Answered
How do I pull out from a table, the total mean of one item based on a particular condition (for several subjects), and then compute the difference in mean values?
You can do the first part with groupsummary Subject = [1 1 1 1 2 2 2 3 3 3 3]'; ItemA=[30 20 45 55 17 45 13 56 12 34 15]'; Co...

3 days ago | 0

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Answered
display a shared legend for bar graph
There's an extraneous call to nexttile at the bottom, but after removing that I see what I'd call a shared legend....can you hel...

3 days ago | 0

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Answered
Cumulative sum with condition
I think what you're looking for is groupsummary (or grouptransform): x=[rand(10,1) randi(3,10,1)]; % this is the sum for group...

3 days ago | 0

Answered
plotting a line of best fit using a for loop
you're plotting your x values against a scalar (Bfit(a)). I'm a little unclear about what you're tring to do here (your polyfit ...

3 days ago | 0

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Answered
EEGLAB - Rename an event
In general, the excel-like find and replace can be done with strrep: bad = {'a' 'b"' 'c'} good = strrep(bad,'"','') But I'm...

3 days ago | 0

Answered
Subscripted assignment dimension mismatch error
When you write: U(1:ki,1:ki)=pi; You're trying to put a 150x1 into a 150x150...Maybe what you intended was: U(1:ki,1:ki)=repm...

3 days ago | 0

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Answered
How can I create a plot with random directions?
It looks to me like left and backwards are kindof the same thing...how about adding x to differentiate them? foward = 1; left ...

3 days ago | 0

Answered
Error during Greyscale tiff image conversion to RGB tiff image
You have a small typo: tagstrut.PlanarConfiguration you missed a c, you wanted tagstruct.PlanarConfiguration

3 days ago | 0

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Answered
Overlay barchart with subplots
Currently your code creates an axes, turns hold on, but then subplot creates a new axes that deletes 'ax' You can add a hold on...

3 days ago | 0

Answered
Re-creating NeuroExplorer's perievent spectrogram with MATLAB
The function you're looking for here is spectrogram, but getting it to produce an something like NeuroExplorer will take some pa...

3 days ago | 0

Answered
How to play a note
The Note you made is a logical: you're asking where abs(t) is less than or equal to (a bunch of stuff) If you want to play th...

4 days ago | 0

Answered
How can I obtain a certain value from the function 'find' from a 3x2 cell?
I think you're asking how to search for the index of a row in a matrix based on multiple columns (although you have a cell array...

4 days ago | 0

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Answered
prevent shaded areas from changing the colors of the bars.
First, you'll want the patch behind the bars, so call patch first. You can keep the transparency on the patch, but if you don't...

4 days ago | 0

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Answered
Convert Cell Array into equation
I think you could use a combination of cellfun (to run on each cell) and eval (to evaluate the expression): a=readtable('matl...

4 days ago | 1

Answered
Error: This statement is incomplete.
MATLAB won't distribute your j to all the locations in your print string, so you need a few more js. Have a look without the eva...

4 days ago | 0

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Answered
programme matlab pour calculer et trace l'histogramme d'une image
im=imread('peppers.png'); % exemple d'image imshow(im) Si vous avez Image Processing Toolbox: figure imhist(im) Autrement...

4 days ago | 0

Answered
A question about ismember function
Check out the documentation page here: https://www.mathworks.com/help/matlab/math/array-indexing.html (Indexing with Logical Val...

4 days ago | 0

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Answered
My mesh grid is giving me a value not a matrix
The question is: how many points do you want in your grid? The : operator, by itself, takes increments of 1: 5:10 The min a...

4 days ago | 0

Answered
Discrepancy between datenum and datetime?
This is one of the many reasons we have datetime, and why we recommend using datetime instead of datenum. If you can use datetim...

4 days ago | 0

Answered
xlabel not working inside a function
You've named the function's parameters xlabel and ylabel. So within the function xlabel and ylabel are variables, not functions....

5 days ago | 0

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Answered
Connect datapoints in Plot
Unfortunately, not all plotting functions accept table variables in MATLAB yet (scatter was one of the first of the 'traditional...

6 days ago | 0

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Answered
drawrectangle draws rectangle even though the mouse is clicked outside the parent UIAxes
You can pass in a DrawingArea to drawrectangle which will constrain the rectangle to the image. That keeps the drawn rectangles ...

7 days ago | 0

Answered
Combining Graphs into one Figure
The command figure makes a new figure, so just remove the second call to figure and you should be in good shape! %% Part 1 ...

7 days ago | 0

Answered
What is the exact reason of this error? I am not getting it. Any help will be appreciated.
As @Mathieu NOE points out, there's something a little strange in your col_headers = line. This line has a bunch of extra charac...

7 days ago | 0

Answered
Merging three 3D plots into one
You can copy the surfaces from each of the axes, in each of the figures that you open like this: a=open('BandL_my_replication_v...

7 days ago | 0

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Answered
Issues with greyscale png images in matlab
This looks like the result of loading an indexed image, you can read the colormap using the second output of imread: [img,cmap]...

7 days ago | 0

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