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MJFcoNaN


Active since 2022

learning and learning

Programming Languages:
Python, MATLAB, Shell, Fortran
Spoken Languages:
English, Mandarin
Professional Interests:
Earth, Ocean, and Atmospheric Sciences

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  • Knowledgeable Level 4
  • 3 Month Streak
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Answered
How to make non iterative code faster than the iterative when using line by line backslash inverse ?
Hello, The example may not show that iterative one is faster, because they are both too simple and fast. I will suggest you tr...

20 days ago | 1

Answered
I can't comment my code with Chinese in matlab2022b
你好, 强烈建议你避免中文字符。 就我所知,Matlab对中文字符的支持并不完善(不知道是不是Windows等操作系统层面的问题),经常出现代码中所有中文字符变成乱码、问号等不可逆损坏的情况。

22 days ago | 0

Answered
How to check if the input it´s a string?
Hello, you may need the 's' option to avoid evaluating text: b1= input('Press number 1 or 2: ','s');

24 days ago | 1

| accepted

Answered
How to get back data from quiver function?
Hello, The vector field is instantaneous, therefore, you have to provide the increment of time for getting a new proximate loca...

1 month ago | 1

Answered
How can I change the variable viewer font?
Hello, You can set fonts separately in: Preference--font

1 month ago | 0

Answered
Matlab kills itself when my matrix is bigger than 7.5 GB
Hello, It is often the RAM that limits variable size and parallel may not help. You may try to allow more RAM by matlab: Prefer...

1 month ago | 0

Answered
Two contour plots on the same figure with two different colormaps?
Hello, As you mentioned, adding a new axes is a normal suggestion to introduce a new colormap, because an axes can only have on...

1 month ago | 0

Answered
How can I run python script file programmed in anaconda virtual environment in MATLAB?
Hello, Matlab does not support python in virtual environment as well as in standard environment. There may be some basic and im...

2 months ago | 0

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Answered
/bin/bash: command not found error
hello, I have answered a similar question recently. This may be helpful: https://ww2.mathworks.cn/matlabcentral/answers/187962...

2 months ago | 0

Answered
How to use a command for the terminal which isn't a standard one?
Hello, 'system' starts a new shell process which may not inherit your familiar environment. I suggest you check the PATH in ma...

2 months ago | 1

| accepted

Answered
Create variables inside the field of netcdf
Hello, "Europe" will be a group name in netcdf: GID = netcdf.defGrp(fid,'Europe'); lat_ID = netcdf.defVar(GID,'lat','doubl...

7 months ago | 0

| accepted

Answered
Error using im2frame
Hello, getframe is the suitable fucntion there: frame = getframe(gcf);

7 months ago | 1

| accepted

Answered
Deleting non identical values of 2 vectors?
Hello, The function of ismember may help you a = [5 6 1 8 4 7 3]; b = [4 5 6 2]; [lia,locb]=ismember(a,b); a(~lia)=NaN

7 months ago | 0

| accepted

Answered
How can I read variables (lat lon and chl-a)in nc files with groups?
Hello, If possible, I will suggest you choose the "level 3 mapped data" which is much more convenient to deal with in matlab, b...

7 months ago | 1

| accepted

Answered
How to fix the figure plot always being above on the screen?
Hello, You may set the figure property of WindowStyle to 'modal' : f=figure; f.WindowStyle='modal'; PS: 'docked' is another ...

7 months ago | 0

Answered
pyrunsfile doesn't work when python script includes "import"
Hello, As I know, there were some python packages that some versions of matlab can't load if you installed them in virtual envi...

7 months ago | 0

Answered
finding the index of NaN
You may use "isnan" A = [10 30 NaN 30] isnan(A) PS: There is a tip from help document "NaN values are not equal to each othe...

7 months ago | 1

Answered
Creating a Timetable from a large excel data set
Hello, What type is the AbsTime? Does this one work? t=table2timetable(m137);

7 months ago | 0

Answered
Connection error Matlab Download and Installation
Hello, It could not be a regular connection problem by firewall or proxy since you can download some parts. I will suggest you...

7 months ago | 0

Answered
Find the nearest point of intersections of circles
Hello, You may need a different method than intersection. For example create a distance function under your own criterion. This...

8 months ago | 0

| accepted

Answered
How to plot an ocean depth profile colormap for a angled coast?
Hello, The 2D or 3D interpolation may help. The method of reading lon and lat suggests your ROMS's grid in a form of "ndgrid",...

8 months ago | 0

Answered
Is there any other function faster than sum(A,2) to get the sum of all rows?
In general, the native functions are optimized sufficiently. In certain cases, there may be some better way but in other parts ...

8 months ago | 0

Answered
Error while finding peak value and location
Hello, You should sort the "x" variable ("vv" in your code) before calling findpeaks load 'vv.mat' load 'cc.mat' for m = 1:n...

8 months ago | 1

| accepted

Answered
How do you determine if a point is to the left or right of a curve?
Hello, Is "to the right" meaning that a red point is in the polygon of blue track? The function of inpolygon may help: [in, on...

8 months ago | 0

| accepted

Answered
Import part of dataset in a HDF5 file, by 'member' and/or 'logical array'
Hello, The "start, count, stride" is suitable for slicing a huge matix. For example this will only read a "vector" from a 2D m...

8 months ago | 0

Answered
why is it not plotting?? blank graph
Why do you comment the lines of calculate y1 and y2? % Ecuaciones Diferenciales Ordinarias dy/dx=f(x,y) a resolver ------------...

8 months ago | 0

| accepted

Answered
How to delete rows from matrix
Hello, This may help: SP_U(ismember(SP_U, SP_d,'rows'),:)=[];

8 months ago | 0

| accepted

Answered
How can I append table to csv file?
Hello, dlmwrite cannot deal with table, but take numetric matrix or cell, such as [1 2 3] or {1,2,3}. You may take the values ...

8 months ago | 0

Answered
Can MATLAB be installed on Apple MacBook Pro 16 (Apple M1 pro met)?
Yes, R2020b update3 and later is working on Rosetta 2 translation including Simulink and almost all toolbox. The latest version ...

8 months ago | 0

Answered
max value of N arrays
You can concatenate all the vectors and use function of max by the given dimension. For example x=[1,3,6,9].'; y=[2,4,5,8].'; ...

9 months ago | 0

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