dpb

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5 085 total contributions since 2012

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Comparing date/time values in Matlab/ calling out date time values to use in code
Convert to a timetable and all kinds of tools are available; see <Overview Timetables> for all of the above kinds of operations

1 jour ago | 0

Answered
Creating a Histogram of Letter grades converted from number grades
One way that illustrates lookup table approach... GRADES=[0,60,69.9,73.9,76.9,79.9,83.9,86.9,89.9,94.9,95.9,100]; % letter grad...

2 jours ago | 0

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Bestfit value doesn't match with the plotted value
Because you used gaussian_fn= @(q,x) (q(1)^2.*exp(-2.*((x-q(2)).^2)/q(3).^2)); as your fitting function -- in which q(1) is sq...

2 jours ago | 0

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Answered
Groupsummary on timetable with cell/matrix data
Took a little head-scratching, but the following appears to work as desired-- fnMN3=@(c){mean(cat(3,c{:}),3)}; % functio...

2 jours ago | 0

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Answered
How to calculate the coefficient of variation in Matlab
N=30; mn=mean(reshape([time(:),speed(:)],N,[])); sd=std(reshape([time(:),speed(:)],N,[])); cv=reshape(mn./sd,[],N); return...

3 jours ago | 0

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Answered
No legend when plotting fit object
Doesn't seem to be any way to prevent the builtin fit object plot() routine from adding the legend. Instead, use plot(x,myfit(...

3 jours ago | 0

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How to create a new array with specific column and row thresholds from txt file
Why do you keep reverting to the hardest way possible to read in a data file? We just showed how easy it is to use readtable @...

3 jours ago | 0

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Multiple 2D plots in 1 3D plot
Well, your data look nothing at all like those in the sample plot and your vectors aren't of commensurate lengths, but-- plot3(...

3 jours ago | 0

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Answered
Loading a 600 mb file ends up astronomically large
Attach the file (or at least a portion of it). Memory usage is only 1:1 with disk storage for numeric data types stored as stre...

3 jours ago | 0

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Reading csv file and counting number of lines that have a category of interest and are below a threshold
>> data=readtable('SampleDataset03.csv'); >> sum(contains(data.Category,'A')&data.Value<0.5) ans = 64 >> For this you d...

4 jours ago | 0

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Answered
plot un-equally spaced data in errorbar
You're looking for x1 = [28 56 112 224]; y1 = [21.2 18.01 16.8 14.38]; sd_vct1 = [4.93 1.77 1.81 2.32]; errorbar(x1,y1,sd_vc...

4 jours ago | 0

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Answered
removing spcific numbers from matrix
Don't need (and don't use) loops -- this is MATrix LABoratory, after all! :) A=A(~ismember(A,B)); or A=setxor(A,B); is the ...

4 jours ago | 0

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Answered
READ TABLE WITH DIFFERENT SETTING INSIDE
It's a fignewton of looking at the text in the editor or on the screen--some was tab-delimited, some space but there's only one ...

4 jours ago | 0

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Answered
Create heatmap from table, error "'XVariable' value must reference a single variable in the source table."
The x,y variables for a table are given as the names of the wanted columns; the dot notation returns the data. heatmap(data_mea...

5 jours ago | 0

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Save generated points in txt file
ndgrid generates X,Y as arrays; in your case 3x3. For output you need to convert to vectors before making the table... T=table...

5 jours ago | 0

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cell indexing, extracting rectangular subset
I just duplicated your example 5 times... tokens=tokens.'; % reshape to column cell array vals=cell2mat(cellfun...

7 jours ago | 0

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How to build and call an array of objects containing a table of data
How about something like test=timetable(datetime(2020,2,13+[0;sort(randi(20,4,1))]),randi([120 240],5,1),'VariableNames',{'Temp...

7 jours ago | 1

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Answered
How to get real p value in the 'multicompare' output table instead of rounded number
As Walter points out beflow, that it prints an integer zero indicates the calculation of the p-value underflowed and the returne...

7 jours ago | 0

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Answered
How to Compare multiple rows of the Same txt file at the same time.
Read the file(s) into memory with importdata or other high-level function appropriate to the format; then use diff() on the seco...

7 jours ago | 0

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finding non-zero entries of a matrix
C=A|B;

7 jours ago | 1

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Resizing Figure to Make Room for Title without Resizing Plot
hAx=gca; hAx.Position=hAx.Position.*[1 1 1 0.95]; adjusts the height of axes to be 95% of default/previous height. Adjust to ...

7 jours ago | 0

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fitting a sloped gaussian
First pass...overall not so great; need to do more to figure out how to model background. My spectroscopy background has dealt ...

7 jours ago | 0

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I am trying to find the shortest path possible in an array of numbers using MATLAB and I keep getting "Index in position 1 exceeds array bounds (must not exceed 5).". I tried changing 5 to any other number and it didn't work. Can anyone please help?
Easy to forget/overlook... n=1: ... while itr < 5 distance = distance + norm([randomA(n,1) randomA(n,2)] - [randomA(n+1,1)...

8 jours ago | 0

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Answered
Writing a small epsilon in xlabel with color
W/o taking time to try to figure out specific LaTeX syntax inside MATLAB that's always a pain since know nuthink' about LaTeX ot...

8 jours ago | 0

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What frustrates you about MATLAB? #2
So many of the nits in graphics are just irritants/time-consuming to make things look decent -- The inconsistency by using '%g"...

8 jours ago | 0

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Using uigetfile to read in MATLAB array - index exceeds number of array elements
The form of load with an assignment on the LHS returns the content of the .mat file in a struct with the variable names in the ....

9 jours ago | 0

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Answered
how can i change the color of the text in the dialog box of errordlg ?
Use the \color{specifier} modifier for the text string passed. Will have to create an options struct to set interpreter to 'Tex...

9 jours ago | 0

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Answered
sorting is not sorting?!
sortrows(y,3); is a no-op because you didn't save the result. y=sortrows(y,3);

9 jours ago | 0

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Answered
Add leading decimal places to numbers in text file
Air code--caution!!! c=readcell('YourTextFile.ext'); % bring file in as cellstr() array isDR=startsWith(c,'DataReg'); ...

9 jours ago | 0

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Answered
Linking variable name/symbol to sequential retrieval of FRED data files.
"-the answer to your q is yes, this particular series are all on monthly freq and return the same dates." Ah! Was hoping for t...

9 jours ago | 0

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