Dave B

MathWorks

Last seen: 4 days ago | Active since 2020

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

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Fill in Surrouding data
You could use conv2 with little kernel and then turn "overlapping" 2's into ones: ttmp = [0 0 0 0 0 0 0 0 0 ...

20 days ago | 0

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densityScatterChart
A scatter where the color (and/or transparency) of the markers indicates the density of points.

5 months ago | 32 downloads |

Answered
Plotting 2 x-axes against 1 y-axis
You can do something like this by creating a second axes, and in these cases it can be handy to use a tiledlayout to keep the tw...

9 months ago | 1

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Answered
Colormaps for plotting lines whose values vary cyclically.
You can do this using the colororder to control the coloring of lines, it has the modulo behavior built right into it. But using...

9 months ago | 0

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Answered
How can i change the colours of segmentation on a chart pie?
Starting in R2023b we have a new piechart which is a little easier to change colors for. Here are some demos with our built in c...

1 year ago | 1

Answered
Ytick label is repeated and not alligend correclty
The reason the YTickLabel is aligned to the left is because MATLAB padded the values with spaces to make a character array. This...

1 year ago | 0

Answered
How to create bar chart with x axis labels as grouped for different data
Unfortunately MATLAB doesn't have a builtin feature for creating hierarchical rulers. An alternate workaround to the one dpb lin...

1 year ago | 0

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Answered
Add shared colorbar on some rows only
You can accomplish this kind of layout by nesting tiledlayouts, and leveraging the TileSpan property. Below, I create a 3 x 1 t...

1 year ago | 3

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Answered
ButtonDownFcn does not work on a plot
How about if you set p3.PickableParts = 'none'? If you're clicking the part of p2 that is on top of p3, then MATLAB is probably ...

1 year ago | 0

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Answered
How to shift streamslice() plot into background?
I think the issue you're running into here is this last argument you're passing into streamslice. The 1 there is causing the lin...

1 year ago | 2

Answered
how to set colormap minimum and maximum for imagesc in tiledlayout
You can grab the Axes object, use gca, or use nexttile to refer to a location in the grid: tiledlayout(1,3); ax = nexttile; ...

1 year ago | 2

Answered
Saving a Plot on a Figure with Transparency Ignores the Transparency
Transparency for lines isn't supported, and so the alpha channel is lost when you save and load. A workaround is to use patch, w...

1 year ago | 0

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Answered
Boxplot group within group
To choose colors for your overlay, you can create multiple Scatter objects, or you can create one scatter object with multiple c...

1 year ago | 0

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Answered
Plotting a circle using geoplot
Would wrapTo360 help here? lat=-42; lon=173; r=20; [latr,lonr] = scircle1(lat,lon,r); nexttile geoplot(latr,lonr,'LineWi...

1 year ago | 0

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Answered
How to change the dimensions of a matrix?
You could use permute to do this, though it's maybe worth noting that you can concatenate matrices regardless of the shape (you ...

1 year ago | 1

Answered
How can I list individual year from the datetime table?
The splitapply function makes this pretty easy - here the idea is to split the data by year, and then apply a function that turn...

1 year ago | 1

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Answered
plot function legend is wrong.
The legend is labeling the first line in the chart rather than the last one. An easy way to specify which line should be labeled...

1 year ago | 0

Answered
Force tiledlayout('flow') to layout vertically
Starting in R2023a you can use the 'horizontal' and 'vertical' tile arrangements to accomplish layouts that are dynamically size...

1 year ago | 2

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Answered
How to reorder a categorical axis?
Three options to change the order, depending on where you want to change it: Option 1: You can use reordercats to re-order th...

1 year ago | 1

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Answered
How do I add a colorbar to a polarscatter chart?
I think you can simplify this task by passing the data directly into scatter deggorad=pi/180; azi=[0;36;72;108;144;180;216;252...

2 years ago | 0

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Answered
Can't change xlabel font because of diacritics (č, ř, š, ...)
The error you're seeing is because of the tex interpreter, although I don't reproduce it with the same characters. If you're not...

2 years ago | 0

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Answered
Error bars for every other bar
I think what you're trying to do is put the errorbars on the first bar series? You can do this using the XEndPoints from the bar...

2 years ago | 0

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Answered
How to color the colormap with a set of hexadecimal colors?
Starting in R2020b you can use the validatecolor function to convert hex to rgb (using the 'multiple' option to convert more tha...

2 years ago | 1

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Answered
How can I write multiple number (digit) in my title?
I think what you're saying is you don't want to compute how many %d's to include and just have all the value separated by commas...

2 years ago | 0

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Answered
I'm trying to duplicate elements in the GUI, buttons to be specific.
If you're making your app in a uifigure (e.g. with app designer) you can create a button with uibutton, if you're making your ap...

2 years ago | 0

Answered
How to extract different element between two cell array?
How about using ismember combined with not (~)? X1 = {'A','B','C','D'} x2 = {'A','B','C','D','E','F','G','H'} X3 = x2(~is...

2 years ago | 0

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Answered
loop with subplot in MATLAB
The first loop creates a figure for each cell, but the next too loops don't. Did you want a figure for each cell? acceleration=...

2 years ago | 0

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Answered
Plotting a graph with different colors depending on different vectors
You can plot multiple vectors by either: passing them into plot as a matrix, plot will make a line for each column of the matri...

2 years ago | 0

Answered
Geographical maps in Matlab
How about something like this? paris = [48.5 2.2 46]; london = [51.5 0.1 48]; newyork = [40.7 -74 54]; natick = [42.3 -71.3...

2 years ago | 0

Answered
UI doesn't show buttongroups but doesn't give any error
The problem you're running into is just the order in which you set Units and Position: bg(i).bg = uibuttongroup(fig,'Title',['S...

2 years ago | 1

Dave B

MathWorks

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