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Dave B

MathWorks

Last seen: 1 day ago Active since 2020

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

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Answered
How can I graph an average and individual participant data?
It's a little difficult to visualize what this looks like, but here's what i took away from looking at your code you have a thi...

9 days ago | 0

Answered
scatter not ploting matrix
Yes this functionality was just recently introduced in R2021a The relevant section from the release notes reads: Scatter Plo...

10 days ago | 0

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Answered
Why do I receive "Index exceeds the number of array elements (1)" ?
You wrote: For some background, m and t are both defined already in my workplace and they are both vectors. But you redefine...

10 days ago | 0

Answered
Drawing a line to divide two parts of a curve
You can draw a vertical line very easily with xline area works well for filling a part of the curve x=linspace(-3,3,100); y...

10 days ago | 0

Answered
51 uniformly-distributed points
You can create uniformly (linearly) distributed values with the linspace function: x = linspace(0, 5, 51) Alternatively, you m...

10 days ago | 0

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Answered
array indexing returns empty row vector while attempting to locate index corresponding to only certain array values
This is an issue of floating point arithmetic, another way to state the problem is: (.1+.2)==.3 What? How can those not be equ...

11 days ago | 0

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Answered
Dealing with Data Structures
I think in general it's better if your struct is an array rather than using names of fields in the struct as an array, but if yo...

11 days ago | 0

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Nested for loop for multipication
I think the question is really how you store your total values (you didn't store them in your snippet, so I'm not sure how you p...

11 days ago | 0

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Answered
fill missing point in data (x y z 3 columns data)
You can use meshgrid to make x and y grids, and then ismember with the rows flag to find which pairs of x and y are missing: % ...

11 days ago | 0

Answered
How to locate the plotting title above the legend, where the legend is placed "northoutside"?
You can put a title on the legend, but I think you just want a master title for everything. You can do that by placing your axes...

11 days ago | 2

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Answered
How to relate data to other data from excel in MatLab?
In general, it's better to think of it not as Height(Name1), but as Height(Species=="Name 1"), this extends to all sorts of data...

11 days ago | 0

Answered
How do I use output values from a function to plot those values in a script
I think what you're looking for is: [t,~,v] = rocket_euler(30,20) plot(t, v, '.-','color',[0 1 0],'Marker','x','markersize',15...

12 days ago | 0

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Answered
select one item between two List Box
How about just using the callback of one to deselect the other: % Set up some example listboxes: u = uifigure; lsta = uilistb...

12 days ago | 0

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Answered
graph with two formulas
You can make the error bars with the errorbar function, but your excel file doesn't appear to include data about error... a=r...

12 days ago | 1

Answered
Call Function from .m file in command
@L McKeehan - perhaps the most common reason for this is that the function is not on MATLAB's search path. When you try to run a...

12 days ago | 0

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Answered
What should be the distance between the two cameras?
This isn't a very MATLAB-y answer, but the lenses in stereo cameras typically try to replicate the distance between the eyes (ac...

13 days ago | 0

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Trying to change columns in a Matrix
Specifying rows and columns makes MATLAB point to rectangles: a(1:2,1:4) refers to rows 1 and 2, columns 1 through 4, i.e. MATLA...

13 days ago | 1

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Answered
Showing the equation of the best fit lines per graph
Are you struggling with how to get the text? or how to display it on the chart? Here I put them in the legend, and also added...

13 days ago | 0

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Answered
Get ticks to lay across colorbar
The unit for TickLength is peculiar. If you check out how it's documented on the colorbar page it says: Tick mark length, speci...

13 days ago | 0

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Answered
Index of value when you want to check multiple elements at the same time between 2 cell arrays
If I understand the quesiton, you want to find indices in A where the values in B are found when they are in A. You can use ...

13 days ago | 0

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Answered
How can I generate random varaible from 0 to 1 without including 0?
The rand function generates randum numbers between 0 and 1, not including 0 or 1: https://www.mathworks.com/help/matlab/ref/ran...

13 days ago | 0

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Answered
Can I Use the matlab in the mobile phone or tablet rather than laptop?
Yes there's information about MATLAB mobile here: https://www.mathworks.com/products/matlab-mobile.html It's pretty difficult t...

13 days ago | 0

Answered
semilogy, loglog do not work in order to set the y axis on a logarithmic scale
When you use the log plotting functions they don't change the axis scale if hold is on. There's a note all the way at the bottom...

13 days ago | 1

Answered
How to plot a matrix containing NaN?
pcolor specifies color at the vertex, which (confusingly) means that you have one less row and column. It does great with NaN th...

13 days ago | 1

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Answered
How do I combine my function's output matrices into a single matrix?
Your function loops over some values and for each one computes a row vector. To store the row vector in a matrix, specify an i...

13 days ago | 0

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Answered
How to compute a vector
Here's how I'd break this down. First, let's have a look at what the syntax produced for X: X=[1,2,3;4,5,6] So X is a matrix...

14 days ago | 1

Answered
Stacked plot /waterfall plots to visulaise figures
If you want to put these data into a waterfall, you can do waterfall(e') but that won't get your time axis correct. Using meshgr...

15 days ago | 0

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Answered
How to plot readed audio files in multiple plots or subplots by MATLAB
It looks like you're as far as getting the filenames, but need to read the data and make the plots. audioread works well for ...

15 days ago | 0

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Answered
Array indices must be positive integers or logical values.
It looks like when you gave findpeaks a sampling rate it converted the units to time: From the findpeaks documentation page: [...

16 days ago | 0

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Answered
How can I specifiy the colors when using the group by color option in boxchart?
BoxChart will use the colors in the active 'colororder', you can change which index they use with SeriesIndex but I'd recommend ...

16 days ago | 0

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