# roudan

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**Content Feed**

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...

6 mois ago | 1 answer | 0

### 1

answerQuestion

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...

6 mois ago | 2 answers | 0

### 2

answersQuestion

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...

6 mois ago | 2 answers | 0

### 2

answersQuestion

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...

6 mois ago | 1 answer | 0

### 1

answerQuestion

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...

6 mois ago | 1 answer | 0

### 1

answerQuestion

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...

7 mois ago | 1 answer | 0

### 1

answerhow 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...

7 mois 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...

7 mois ago | 2 answers | 0

### 2

answersQuestion

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...

9 mois ago | 1 answer | 0

### 1

answerQuestion

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...

11 mois ago | 1 answer | 0

### 1

answerQuestion

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...

plus d'un an ago | 1 answer | 0

### 1

answerQuestion

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...

presque 2 ans ago | 1 answer | 0

### 1

answerQuestion

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 ...

presque 2 ans ago | 0 answers | 0

### 0

answersQuestion

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 ...

environ 2 ans ago | 1 answer | 0

### 1

answerQuestion

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...

plus de 3 ans ago | 1 answer | 0

### 1

answerQuestion

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...

presque 4 ans ago | 0 answers | 0

### 0

answersQuestion

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 ...

presque 4 ans ago | 2 answers | 0

### 2

answersPython-like generator for reading large CSV file?

Thank you, Guillaume. That is awesome! I appreciate it.

presque 4 ans 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...

presque 4 ans ago | 3 answers | 0

### 3

answersQuestion

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...

presque 4 ans ago | 2 answers | 0

### 2

answersQuestion

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...

presque 4 ans ago | 0 answers | 0

### 0

answersQuestion

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...

presque 4 ans ago | 0 answers | 0

### 0

answershow 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...

presque 4 ans ago | 0

| accepted

How to display trendline equation on the plot?

ok, I got it now. here are my codes, fittedlinecrossplot=polyfit(xdata_crossplot,ydata_crossplot,trendlinepolynomialcoeff)...

presque 4 ans 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...

presque 4 ans ago | 2 answers | 0

### 2

answersQuestion

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 ...

presque 4 ans ago | 1 answer | 0

### 1

answerQuestion

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? ...

presque 4 ans ago | 1 answer | 0

### 1

answerQuestion

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...

presque 4 ans ago | 0 answers | 0