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roudan


Active since 2017

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Question


how to sort table by row sub-string values?
Hi I have a table like shown in the first picture. I'd like to sort this table using the last 2 characters of string, for examp...

3 months ago | 1 answer | 0

1

answer

Question


contourf without isoline but with label
Hi below code from below question to remove the isoline. But I'd like to keep label with it. How to do it? https://www.mathw...

3 months ago | 2 answers | 0

2

answers

Question


how to save plot handle in an array and delete the plot later?
Hi In my plot, I have 10 plots. I am creating a 1D array using handle_array=zeros(10,1), then later I save ith plot's handle to...

3 months ago | 2 answers | 0

2

answers

Question


how to add a STAR or Triangle shape to plot simply without knowing their vertex?
Hi I have a contourf. I'd like to just add a simple Star or Triangular shape to certian location within the plot. I am thinki...

3 months ago | 1 answer | 0

1

answer

Question


how to send pcolor contour to back when updating contour z value?
HI I used to use contourf() and plot() with correct order so line plot is always on the top of contourf. Now I change to use pc...

3 months ago | 1 answer | 0

1

answer

Question


how to combine datetime array with cell array for export?
Hi I have one 1000 by 1 string cell array and one 1000 by 1 datetime array. I'd like to combine them together so export. Here i...

3 months ago | 1 answer | 0

1

answer

Answered
how to expand the date matrix?
ok, Here is what I come up with, not efficient. could you please review it and appreciate any suggestion for improvement. Tha...

4 months ago | 0

Question


how to expand the date matrix?
Hi I need your help. I have a csv file with date minimum and date maximum in the last 2 columns. I'd like to expand the date...

4 months ago | 2 answers | 0

2

answers

Question


How to keep information private?
when I googled my names, all my activities( like asking questions, my profile) in Mathworks show up. I am wondering if I can kee...

5 months ago | 1 answer | 0

1

answer

Question


how to expand 2D array?
Hi I create an array with shape of (2, 4), now I'd like to expand the array by 2 times in rows and 2 times in columns so the sh...

7 months ago | 1 answer | 0

1

answer

Question


use xlread to read csv file with mixed type data is very slow
Hi I have a csv file with mixed data type like below, first column is string, 2nd column is numerical, 3rd column tothe end c...

1 year ago | 1 answer | 0

1

answer

Question


Is there a PDF for all Matlab Functions?
Hi There is online version of list of all functions. https://www.mathworks.com/help/matlab/referencelist.html?type=function&li...

1 year ago | 1 answer | 0

1

answer

Question


plot distribution without interpolated contour
Hi Could you please help me with one question which has been with me for a long time? The below left figure show contour plot ...

1 year ago | 0 answers | 0

0

answers

Question


interpolation with non-zero data only when using griddata
Hi Happy New Year! Could anyone here help me with below issue? I am trying to show the contour of Well Injection Pressure ...

2 years ago | 1 answer | 0

1

answer

Question


how to control movie play rate?
Hi I am using videowriter and writevideo to generate a movie. The movie generated play too fast so I cannot see it. I am won...

3 years ago | 1 answer | 0

1

answer

Question


Can I use subvolume for 2d dateset?
I have a 2d dataset with northing easting coordinates. I like to extract a sub area with 4 corner points defined. Can I use subv...

3 years ago | 0 answers | 0

0

answers

Answered
how to redraw contourf after changing scale
thank you Walter

3 years ago | 0

Question


how to redraw contourf after changing scale
I used contourf. after changing the scales like colorbar min/max/interval, contour line interval etc, how to redraw the contour ...

3 years ago | 2 answers | 0

2

answers

Answered
Python-like generator for reading large CSV file?
Thank you, Guillaume. That is awesome! I appreciate it.

3 years ago | 0

Question


single precision data for griddata()
Hi when I use griddata(x,y,v, xq,yq), x,y,v,xq,yq are all single-precision data to save the memory. but there is an error say...

3 years ago | 3 answers | 0

3

answers

Question


Python-like generator for reading large CSV file?
I have a large csv file, typically I just read everything into a array like this num =csvread(filename,2,2) if csv file is...

3 years ago | 2 answers | 0

2

answers

Question


how to plot this time contour?
<</matlabcentral/answers/uploaded_files/108409/10.JPG>> Hi I saw someone plot this time countour. I don't know how to plot...

3 years ago | 0 answers | 0

0

answers

Question


Out of Memory for using many global variables
Hi I have many functions. so instead of use the variables as function arguments to transfer values between functions. I set m...

3 years ago | 0 answers | 0

0

answers

Answered
how to read big excel file faster?
Thanks Walter and Bob, are you guys talking about the same thing like using actxserver('Excel.Application') when Walter was sayi...

3 years ago | 0

| accepted

Answered
How to display trendline equation on the plot?
ok, I got it now. here are my codes, fittedlinecrossplot=polyfit(xdata_crossplot,ydata_crossplot,trendlinepolynomialcoeff)...

3 years ago | 1

| accepted

Question


how to read big excel file faster?
Hi I have a big excel file like 200MB and I am using xlread(). It is easier to use xlread(). But as the number of variables i...

3 years ago | 2 answers | 0

2

answers

Answered
pole plotting on stereonet
ThanksSarah. I appreciate it.

3 years ago | 0

Question


How to display trendline equation on the plot?
Hi I got the trendline using polyfit() and polyval(). and use plot() to the plot the trendline. Now my question is how to ...

3 years ago | 1 answer | 0

1

answer

Question


how to plot the lower or upper boundary lines for scatter data?
Hi I have a scatter plot. I'd like to plot the lines connecting the points either the upper or lower bound. How to do it? ...

3 years ago | 1 answer | 0

1

answer

Question


how to control xticklabel location?
Hi I change y limit, then my xticklabel location is aligned with previous y limits. For example, in the attached figure, o...

3 years ago | 0 answers | 0

0

answers

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