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How do I reliably extract the date from a string, given that it could be in a number formats and positions?
C = {'368446-SN.24260046-12.08.2026';... '368446-SN.24260046-12.08.26';... '368446-SN.24260046.12-08.26'}; tkn = re...
23 days ago | 0
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Extract individual member fields from h5 file
Inspect the HDF5 layout What does Group actually point to? info = h5info(filename, Group) Look carefully at: info.Datatype ...
25 days ago | 0
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I cant evaluate an expression after integrating using the symbolic toolbox
The main issue is that eval is not the correct way to convert symbolic expressions to numeric values. For symbolic results, use ...
26 days ago | 1
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How can i merge three mat.fig in a single figure as subplots which has multiple axis
The error get thrown because each .fig contains more than one axes object, so ax2 is not a scalar. When you write: ax2.Layout.T...
26 days ago | 0
str2double function for HEX values
C = {'0.123', '0x1a', '0x1A', '0xAB', '0X1a', '0x1e', '12.5'}; V = cellfun(@convertValue, C) function val = convertValue(t...
1 month ago | 1
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Question about simscape.getLocalSolverFixedCostInfo returning MaxIterations = -1
Your understanding is basically correct, but there is an important distinction between: The fixed-cost local solver analysis pe...
2 months ago | 0
How to use eval(sprintf) without padding?
filename = 'bis_trodes - Copy.txt'; % Read the text file as whitespace-delimited data. % This handles spaces and tabs between ...
2 months ago | 0
Help with Saving a Matrix After Each Loop in a For Loop
The 18 matrices correspond to the 18 combinations of ii = 1:6 and kk = 1:3. Therefore, the separate jj loop is unnecessary. Inst...
2 months ago | 0
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writecell produces two cells when Range is a sigle cell
Try this: Rng = sprintf('%1$s%2$d:%1$s%2$d', ColmnName{jj}, irow); writecell(Cost, fnameout, 'Sheet', 1, 'Range', Rng); Learn...
2 months ago | 0
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What exactly does ε represent in numerical computing
Epsilon is just a letter. Like all letters, epsilon can mean lots of different things, just like the letters "alpha" and "gamma"...
2 months ago | 0
Regression Learner App. Model Performance
You are probably not doing anything wrong. The confusion comes from the fact that the Regression Learner App reports multiple pe...
2 months ago | 0
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How to ensurethat the sum([0.7 0.2 0.1])==1 return true when testing equivalence relation
"I think the error is caused by the floating number representation error, what is the best practice to compare two floating numb...
2 months ago | 2
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Command fscanf does not read zero
This looks correct to me: fid = fopen('test.txt','rt'); mat = fscanf(fid,'%f',[6,Inf]).' fclose(fid); For comprison: type t...
2 months ago | 0
datetime format with T time demarcation
dt1 = datetime(2023,8,1,11,07,56, "Format","yyyy-MM-dd'T'HH:mm:ss") dt2 = dt1 + minutes(1)
2 months ago | 0
When does distributing data improve computation time over overhead expense?
Let’s break your three questions down clearly. 1) Yes, syntactically and conceptually, your usage is correct. However, correctn...
2 months ago | 1
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Overwriting table columns with ()-indexing
I supect that the cause is consistency of behavior. Consider your example but not replacing the entire column, but only from one...
3 months ago | 1
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Why can't I use "end-2:end" for the meaning of last 2 columns?
"Why can't I use "end-2:end" for the meaning of last 2 columns?" Because that specifies the last three columns. The last two co...
3 months ago | 2
Possible to use box or violin plots, with unequal x and y axis spacing?
Horizontal, stats toolbox: x_positions = [1.2,3.5,7.8]; data = [ randn(50,1)+1; randn(50,1)+2; randn(50,1)+3 ]...
3 months ago | 0
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What is the main difference between matlab and simlink
MATLAB (MATrix LABoratory) is a programming language and computational environment. What it’s used for: Numerical computing D...
3 months ago | 1
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datestr returns erroneous result (MATLAB Version: 9.9.0.2037887 (R2020b) Update 8)
"When I provide datestr with a datenum produced by a format, it does not return the same value" It does when you provide the co...
3 months ago | 0
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How to set a tolerance?
The first rule of debugging: look at the data! data_1 = readmatrix('DataSet2_Test.txt') % much better than LOAD %Characterize ...
4 months ago | 0
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Unexpected size change when assigning a scalar to a 0x0 matrix using (:, :) indexing
As far as I can tell this behavior is not explicitly documented. The rule seem to be something like this: if and only if all non...
4 months ago | 1
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Introduction to Matrix inversion and finite element analysis. Is this code right?
Yes, the code looks correct. Here is a quick sanity-check of each key piece: DOF numbering is consistent throughout: node i own...
4 months ago | 1
persistent variable from previous run is not deleted during a new run of my .m file
MATLAB is not C. The tidiest way to avoid that ugliness is to use nested functions: https://www.mathworks.com/help/matlab/matla...
4 months ago | 2
How to find a rotation vector for use in rotate, if the rotation matrix is rank deficient?
You have two separate problems happening: Wrong solver for homogeneous systems: linsolve and lsqminnorm are for Ax=b with b~=0....
4 months ago | 0
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problem with patch fill color
After x_outer ends at r_max·cos(el_min), your lower_line_x starts at x_inner(1) = r_min·cos(el_min), creating an implicit jump a...
4 months ago | 1
How to print a line of text with multiple variables
%Initial Uncalibrated Meas. p_analog_uncal = [20,40,60,80,100,120]; dV_avg_uncal = [1.246378,1.500449,1.763329,2.015415,2.29...
4 months ago | 0
Using timeit() in the debugger causes function speedup until edits are made
This behaviour is almost certainly due to MATLAB's JIT (Just-In-Time) engine: https://blogs.mathworks.com/loren/2016/02/12/run-...
5 months ago | 1
Want to know the output format of audioread of .wav file captured by hydrophone
Short Answer: the default mode is normalized (dimensionless), NOT Volts or Pascals. MATLAB's audioread in default mode reads th...
5 months ago | 1
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How to correct the grouping variables in splitapply ?
The error is coming from this line: weightpercentages = [app.Callingapp.Osmotisk_data.Weight_percent_best_salt_1 app.Callingapp...
5 months ago | 0
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