Duncan Po

Last seen: 3 days ago | Active since 2013

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Split arrays in table into separate rows
I think you can do what you want in several steps. % Convert your cell arrays in voxel_coord, R2s, and MT into arrays using cel...

3 years ago | 1

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Select a cell table
If you want the value in RESP0234_SOZ_TABLE{2,2}, use eval to evaluate that expression: for i=1:length(numbers); j=numbers...

3 years ago | 0

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Timetable_Averaging values from each month
Use groupsummary with 'monthofyear' binning T = timetable(datetime(2000,1:(12*21),1)', rand(12*21,1), 'VariableNames', {'USDM_i...

3 years ago | 0

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Efficient way to standardize large amounts of text
You may be able to use patterns. For example, suppose the standard format is letters followed by underscore followed by numbers,...

3 years ago | 0

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How to solve the Operator '-' is not supported for operands of type 'table'?
z should be a matrix instead of a table. z is defined using parentheses indexing in your code: z = LSinclination(:,5); This re...

3 years ago | 0

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splitting column in table without creating new variables
Unstack may be the function you need to convert your table into a column for each trial, and then use braces indexing to convert...

3 years ago | 0

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Merge columns with different cell input
Can you convert your empty char '' into empty array []? Tables can be concatenated with empty array but not empty char: t = tab...

3 years ago | 0

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plot specific time points of everyday in an automated data
See this example of checking the hour component of a datetime, and then using logical indexing to extract a time range: dt = da...

3 years ago | 0

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Plotting acceleration vs time on Matlab from accelerometer data that doesn't have a time column
You can create a timetable, and just supply the start time and frequency. Timetable will compute the timestamps for your data. F...

3 years ago | 0

Answered
Accessing data in matrix entries of tables
You can use multiple sets of curly braces {} to index into cells, and then use parentheses to index into the resulting arrays, l...

3 years ago | 1

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Answered
Categorize data in if else statement
You can discretize the BMI values into categories and then count them, like this: >> c = discretize(BMI, [0 18.5 24.9 29.9 34.9...

3 years ago | 1

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Find maximum for each Image in table
You can use groupsummary to find the maximum value of each group: T1 = groupsummary(T, 'MaxPosition', 'max', 'Intensity');

3 years ago | 2

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creating table of finely spaced xy points that represent a box corner
meshgrid may be the function you are looking for. For example, >> [x,y] = meshgrid(1:5,1:5) x = 1 2 3 4 ...

3 years ago | 0

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Rapid access and data manage of a table with cell array in the columns
You can use cellfun. For example, to compute the maximum of each column of the H3raw cell column for each row, do this: cellfun...

4 years ago | 0

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Plotting Timetable in Matlab
The line: Time=TR({'05-05-2020','05-06-2020 00:00:00'},:); only extracts two rows from TR. So Time only has two rows. Then w...

4 years ago | 0

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Grouping based upon differences in time, with some small scatter
One way to do this is to use isbetween in a for loop, and then unique(, 'rows') to find the groups: t = datetime({'27-Aug-2020 ...

4 years ago | 0

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How can I track time periods under certain criteria?
You can put your data in a timetable and then use movsum like this: tt = readtimetable('Daily_Data_Thessaloniki.xlsx'); tt.thr...

4 years ago | 0

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PLOT ACTION IN TIME LAPS
Your data is best represented as a timetable in MATLAB. You can then use stackedplot to generate the visualization. haa = readt...

4 years ago | 1

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Spatial correlations with a timeseries
corr works on columns in 2D matrices. Your local temperature is a row, so you need to tranpose it: local_temp = local_temp...

4 years ago | 0

Answered
Combine timetables vertically different variables
You can use outerjoin with MergeKeys option set to true. You need to specify your common variable names (in addition to 'Time') ...

5 years ago | 1

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How to stackedplot with text data
What do you expect to see with your text data in the plot? stackedplot ignores text data, but plots categorical data. If your ...

5 years ago | 0

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What unit does the frequency have (MATLAB Color Histogram)?
The Y axis is number of pixels. The image in the example is 384x512, so it has 196608 pixels.

5 years ago | 0

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Help with creating histogram
If you convert to categorical, you can sort the counts by descending order: a = randi(10,10,10); histogram(categorical(a), 'Di...

5 years ago | 0

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Is there a way to plot multiple graphs in one "subplot" of a stackedplot figure?
stackedplot can plot multiple lines in the same axes. One way is to have a non-column matrix as one of your table variables: x ...

5 years ago | 6

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I can't plot two lists as histograms as different colors on the same plot. Hist wants 'Numeric Input'
What does class(list1) return? If it returns anything other than a builtin numeric class, that would be the reason for your erro...

7 years ago | 0

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arrange multiple 2D histograms in 3D
You can use the hist function to plot one histogram, then grab its vertices from the resulting patch object. Pass these vertices...

8 years ago | 1

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how to extract subbands from pyramidal directional filter bank/contourlet decomposition of an image?
You need the contourlet toolbox: <http://www.mathworks.com/matlabcentral/fileexchange/8837-contourlet-toolbox>

8 years ago | 0

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Two bar graphs - two data sets - different bin width
histogram/histcounts have builtin support for Freedman-Diaconis rule: histogram(x, 'BinMethod', 'fd') or [n, binedges] ...

8 years ago | 0

Answered
When brushing 3-d scatter, why does the marker not change?
Are you using R2014b? There is a bug in that version. Good news is it is fixed in 15a, so if you update, brushing on scatter3 wi...

8 years ago | 1

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How to do sliding window operation in Matlab?
R2016a has a new function movsum: >> x=[4,1,1,1,2,2,3,5,9,7,7,7,6,6,1,1,2,3,4,4] >> movsum(x,10,'EndPoints','discard') ...

8 years ago | 2

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