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Leon


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Last seen: 2 months ago Active since 2011

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Question


How to read this kind of info out of a txt file and post them into Excel files?
I receive the below info from emails and would store them into an txt file named FmEmail.txt. The info is composed of several gr...

2 months ago | 1 answer | 0

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answer

Question


Need help using contourfm in Map plotting
Normally, I can use contourf to plot a countour like this: [C1, h1] = contourf (X, Y, Z, [7.9:0.005:8.2], 'LineStyle', 'none' )...

2 months ago | 1 answer | 0

1

answer

Question


How to blank a grid value with a boundary file?
I have a grid like the below: [X, Y] = ndgrid([-180:0.25:179.75],[-90:0.25:89.75]); Z = griddata(...); %on the same grid as X ...

2 months ago | 1 answer | 0

1

answer

Question


How to find the nearby sampling stations
I have millions of samping sations, my goal is to find the nearby stations with a certain distance threshold. What is the best w...

2 months ago | 1 answer | 0

1

answer

Question


How to convert arc length to km?
My goal is to find a good function to calculate the distance for two points for millions of data points. I found the fucntion ll...

2 months ago | 1 answer | 0

1

answer

Question


How to create a callback for radio buttons
I have a group of radio buttons with 3 choices (app.mode1, app.mode2, and app.mode3) in app-designer. When a user clicks one of ...

3 months ago | 1 answer | 0

1

answer

Question


How to change the button names depending on different situations?
I'm referring to buttons within app-designer. For example, I would want the button to be called "load" in one situation, and "p...

3 months ago | 1 answer | 0

1

answer

Answered
Matlab textArea automatic new line issue
It turns out that the issue are the square brackets. Once I replace them with strcat, everything works perfectly now. Before: ...

3 months ago | 1

| accepted

Question


Limits of app-designer spinner input field
I have an app-designer spinner input field called app.A. I can set its limits by below: app.A.Limits = [1, max(cruiseList)]; H...

3 months ago | 1 answer | 0

1

answer

Question


How to find the index of a column data whose values are equal to another column data?
For example: A = [31; 2; 57; 36; 87; 36]; B = [2; 36]; My goal is to find the inex of all the column A that are equal to any ...

3 months ago | 1 answer | 0

1

answer

Question


Matlab textArea automatic new line issue
I'm trying to generate a list of items. For each research cruise, its Year, Month, Day, Longitude, Latitude, etc. should all be ...

3 months ago | 2 answers | 0

2

answers

Question


How to establish the handle value of a personalized plot function?
I need to develop a program that will: (a) plot one set of data into a figure at a time, (b) when the next set of data is plot...

3 months ago | 1 answer | 0

1

answer

Question


How to write this line of code to create a Matlab table?
I have unknown number of column variables in cell array: Var{1} = [ 1; 2; 3; 4; 7]; Var{2} = [33; 10; 46; 7; 2]; ... If I kn...

7 months ago | 1 answer | 0

1

answer

Question


Anyone has issues with the Mathworks Community forum system?
I mean the system I'm using to ask this question. A lot of the time it would freeze for no reason and become uneditable. I wou...

7 months ago | 0 answers | 0

0

answers

Question


Is it possible to have a column data with some numerical values and some strings?
I have some really large data with millions of rows. I would have a column with 95% of them being numerical and 5% being strings...

7 months ago | 1 answer | 0

1

answer

Question


How to read out the strings from this Excel file?
Attached is the Excel file. Here is the code I use to read values out of the Excel file: T1 = readtable ('test.xlsx'); Unfo...

7 months ago | 1 answer | 0

1

answer

Question


How to first form a variable and then assign values to it?
My variable can be anything like the below: if case1 Var = Temperature elseif case2 Var = Pressure elseif case3 V...

8 months ago | 1 answer | 0

1

answer

Question


How to position radio buttons into grid layouts in App Designer?
Is it possible to position each of the radio buttons in a radio button group into a grid layout? Many thanks.

8 months ago | 1 answer | 1

1

answer

Question


How to form a structure array variable?
I have a structure array like the below Test{1}.a = [1; 2; 3]; Test{1}.b = [7; 3; 22]; Test{1}.c = [4; 9; 22]; ... If I hav...

8 months ago | 2 answers | 0

2

answers

Question


Is there such a table units identification approach?
Imagine I have a table T1. We know its units will be Units = T1.Properties.VariableUnits; Similarly, its header will be Heade...

8 months ago | 2 answers | 0

2

answers

Question


How to replace -999 values with NaN in a Matlab table?
I have a Matlab table T1, with columns like the below: T1.year T1.month T1.day T1.var1 T1.var2 ... Some of its columns a...

8 months ago | 2 answers | 0

2

answers

Question


How to bold a phrase in a textbox?
Below is my code. How do I bold the phrase "Flag: "? C = [C, newline, ['Flag: ', num2str(B(i)) ] ]; app.text1.Value = C;...

9 months ago | 1 answer | 0

1

answer

Question


How to check if a column data is equal to any of a group of values?
I have a column data A like the below: A = [1; 3; 2; 7; 11; 6]; B can be a group of numbers with unknow counts. For example B ...

9 months ago | 4 answers | 0

4

answers

Question


string join does not work for char arrays?
I have a column list of numbers like the below M = [2; 3; 5; 7; 16]; What I want is to create a string array like this "2, 3,...

10 months ago | 4 answers | 0

4

answers

Question


How to find unique group of numbers?
I have a cell array like the below, storing some groups of numbers: C{1} = [1; 3; 4]; C{2} = [3; 9; 135; 278]; C{3} = [6; 89;...

10 months ago | 1 answer | 0

1

answer

Question


How to write special characters into an Excel cell?
I'm trying to write the units of my table into the 2nd row of my Excel file. Below is the code: writecell(T.Properties.Variable...

10 months ago | 1 answer | 0

1

answer

Question


Adding a unit row to a table
Below is how I normall create my table in Excel: TT = table(Year, Month, Day, Longitude, Latitude, Oxygen, Chlorophyll_A); wri...

10 months ago | 1 answer | 0

1

answer

Question


How to preserve subscript or superscript formatting in a text string?
I'm reading out some text strings (units) from some Excel files: filename = 'AAA.xlsx'; opt = detectImportOptions(filename); ...

1 year ago | 0 answers | 0

0

answers

Question


How to read units on a 2nd row out of an Excel file?
Attached is an example Excel file. I'm using this command to read the info out of the file: T1 = readtable('test.xlsx', 'Pres...

1 year ago | 2 answers | 0

2

answers

Question


How to force y-axis values not to use scientific notation in axes?
My y-axis ranges from 0.001 to 0.003, it always shows up as 1-3 x 10^-3. How do I force it show up as 0.001 to 0.003?

1 year ago | 1 answer | 0

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answer

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