Community Profile

photo

Leon


NOAA

91 total contributions since 2011

Contact

Leon's Badges

  • Thankful Level 4
  • First Answer

View details...

Contributions in
View by

Question


Please help me choose the best hardware for my Matlab processing
I have around 50 million rows of data to process. The number will be increasing into the future. I want to invest around $10K on...

1 giorno ago | 0 answers | 0

0

answers

Question


How to use Matlab compiler to compile a program when it interacts with multiple folders?
I have a large Matlab program that interacts with several folders in my working directory. Where will the folders be if I use Ma...

2 giorni ago | 0 answers | 0

0

answers

Question


Why does Matlab require a Parallel computing toolbox in order to use more CPU cores?
Is it true that if I have a multi-core CPU computer and Matlab will only use one of the CPU cores, unless I leverage the paralle...

2 giorni ago | 1 answer | 0

1

answer

Question


How to extract the numerial values out of readtable output?
Good afternoon! My apologies for the many questions related to readtable. Attached is my data file. I use the below command to ...

11 giorni ago | 1 answer | 0

1

answer

Question


Table values that is a scalar string
I use readtable to input an Excel file into Matlab. T1 = readtable('AA.xlsx'); Now I know T1(3,48) = '32WC20110812', but I ...

11 giorni ago | 2 answers | 0

2

answers

Answered
xlsread error: Array indices must be positive integers or logical values.
Thanks all for the replies. I'm using Excel Version 16.25 on MacOS 10.14.5

11 giorni ago | 0

Question


xlsread error: Array indices must be positive integers or logical values.
When I try to use xlsread to read the attached Excel file: [A B C] = xlsread('AA.xlsx'); Why do I keep getting this error? It ...

11 giorni ago | 2 answers | 0

2

answers

Answered
How to determine if a string can be converted to a numerical value?
Old thread, but the function 'isfloat" will do the trick.

11 giorni ago | 0

Question


How to arrange app-designer interface so that I can zoom it in and out?
Below is how I set up the mainwindows size and then the size of each figures. The issues is that if I'm switching to a larger mo...

17 giorni ago | 0 answers | 0

0

answers

Question


how to turn off this display in the command window?
I'm using the app-designer of Matlab to create an app. The below display keeps showing up on my command windows, slowing down my...

22 giorni ago | 0 answers | 0

0

answers

Question


How do I specify the cell array to indicate strings in double quotation?
I have an array of strings (pulled from Excel column headers). For example, A{1,1} = 'Station Number' A{1,2} = 'Depth' etc...

2 mesi ago | 1 answer | 0

1

answer

Question


How to get the numbers that do not overlap with another matrix?
Imagine, I have a matrix A = [1, 2, 5, 7, 9]; and B = [1,3,5]; How do I find all numbers in Matraix A that do not already overl...

2 mesi ago | 1 answer | 0

1

answer

Question


How to find the location of the first string matching my searching criteria?
My goal is to find the column number of the variables stored in my Excel file. Below is my code. Now B stores the column headers...

2 mesi ago | 1 answer | 0

1

answer

Question


Setpath error: the path file pathdef.m might be read only
I need some external functions to run my program. They are saved in a different folder. The problem I'm having is that I can not...

2 mesi ago | 0 answers | 0

0

answers

Question


How to combine string and numbers before using xlswrite to export data into an Excel file?
I have like to write the below information into one Excel spreadsheet: Cruise # Longitude Latitude Year Month Day S...

3 mesi ago | 1 answer | 0

1

answer

Question


How to clear the contents of an app designer text area?
Below is my code: % --- create a file to store the QC comments --- File1 = ['comments/QCcomments_' app.FileName.Value '.txt'];...

3 mesi ago | 0 answers | 0

0

answers

Question


How to streamline this code to average certain rows?
I have a three row column data: lon lat and Z. What I want to do is to round longitude and latitude to 2 digits. For example, 65...

9 mesi ago | 1 answer | 0

1

answer

Question


Parallel computing out of memory
I just started my trial of Parallel Computing Toolbox, unfortunately, with little success. Now I can see that my program is util...

9 mesi ago | 0 answers | 0

0

answers

Question


How to make Matlab faster
I'm running a program that takes several days to finish, but it only consumes 30% of my computer CPU and less than 30% of my RAM...

9 mesi ago | 1 answer | 0

1

answer

Question


Need help on Matlab memory error
Below is the error I got while using divagrid on Matlab. Anyone has a solution? How do I expand the available space? My computer...

10 mesi ago | 1 answer | 0

1

answer

Answered
How can I run MATLAB in batch mode on my Mac when I log in remotely so that the process runs when I am logged out?
The command seems to be truncated. Anyone has the full command? Thanks!

10 mesi ago | 0

Question


How to show the progress of a program without using disp()?
Recently, I've been running several large programs that would take many days to finish. It's very important for me to know the p...

10 mesi ago | 1 answer | 0

1

answer

Question


How to convert gif to movie?
I just created my first gif animation for my ppt presentation. The problem is that it does not have a "play" or "pause" button. ...

12 mesi ago | 0 answers | 0

0

answers

Answered
how to specify points outside a polygon?
Many thanks for the help!

circa un anno ago | 0

Question


how to specify points outside a polygon?
For example, in the below code, I can specify the points inside the polygon. How about outside the polygon? How do I specify t...

circa un anno ago | 2 answers | 0

2

answers

Answered
How to plot a geographical map from 0 to 360 degree of longitude
If you have the longitude and latitude values, all you need to do is to go through the longitude and convert it to a 20-380 syst...

circa un anno ago | 1

Question


How to set all elements of a matrix that meet a certain criteria to NaN?
I have a Matrix A with the size of [200 100 20 60]. How do I set all elements larger than 10^20 as NaN?

oltre un anno ago | 1 answer | 0

1

answer

Question


How to calculate the mean values in this case?
I have two matrices: both of them have sizes of 200x100x50. The third elements (50) are time. In Matrix One, the time starts fro...

oltre un anno ago | 1 answer | 0

1

answer

Question


How to quickly find the position of a value in a sorted column data?
I have a list of ascendingly sorted data A = [-80, -79.6, -79.2, -77, 65,... 45]. If there is a value B, how do I quickly find t...

oltre un anno ago | 1 answer | 0

1

answer

Question


How to draw a smaller boundary?
I have a two column data of Te2000 and Ar2000. I can plot the points and their boundary without any issue like this: plot...

oltre un anno ago | 1 answer | 0

1

answer

Load more