# Yu Li

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**Content Feed**

Question

error when calculate differentiation of circle function

Hi: I have a circle function: (x-x0)^2+(y-y0)^2=r^2; in order to calculate th tangent of this function, I organized th...

12 months ago | 0 answers | 0

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answersQuestion

anyway to find common tangent for two functions

Hi: I have two functions, and I want to find a tangent circle with a given radius, for example, function y=0.5*x and y=x^2,...

12 months ago | 1 answer | 0

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answerQuestion

anyway to color 2D triangular plot with "CData"

Hi: I have a 2D triangulation data including vertices and connectivity, I want to color it with the value at its geometry c...

1 year ago | 1 answer | 0

### 1

answerQuestion

axis equal & off not work for trisurf function

Hi: I want to plot figure by 'trisurf', if I use order below: f=figure; axis equal axis off trisurf(xxx...

1 year ago | 1 answer | 0

### 1

answerQuestion

how to split these char format into lines

I have a char format data which is read from the last several lines of a file, from Linux system, by command provide by this ans...

2 years ago | 2 answers | 0

### 2

answersQuestion

any easy way to get the index of line

Hi: I have a set of lines and I plot them together, what I want to do, is to locate one line and then find its index, i.e. ...

2 years ago | 0 answers | 0

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answersQuestion

triangulation between two circles

Hi: I have two circiles which is constructed by points. With the known coordinated of the points on these two circl...

2 years ago | 1 answer | 0

### 1

answerQuestion

anyway to call matlab function without bracket

Hi: the usual Matlab function need to be called like: function(input), but I noticed that some function such as 'save', can...

2 years ago | 1 answer | 0

### 1

answerQuestion

anyway to give separate color to 'stack' bar plot

Hi: I read an post from link below: https://www.mathworks.com/matlabcentral/answers/175955-how-to-assign-a-label-to-ea...

2 years ago | 1 answer | 0

### 1

answerQuestion

problem while using 'intersect' between strings

Hi: I have two strings: s1='bound10-wall1.out' s2='bound10-wall24.out' and I need the intersect between them, then, ...

2 years ago | 1 answer | 0

### 1

answerQuestion

understanding about idea in a Matlab Graphics blog

Hi: I read through a Matlab blog : https://blogs.mathworks.com/graphics/2015/07/22/implicit-surface-intersections/ I'm...

2 years ago | 0 answers | 0

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answersQuestion

question about indexing of logic matrix

Hi: I read through the blog presented in link: https://blogs.mathworks.com/graphics/2015/07/22/implicit-surface-...

2 years ago | 2 answers | 0

### 2

answersQuestion

imread not working for gif problem

Hi: I have a gif and I want to read into Matlab, but it does not work, is there any mistake with my operation? the cod...

2 years ago | 1 answer | 1

### 1

answerQuestion

anyway to call checkbox in appdesigner programmatically?

Hi: is there anyway to call checkbox in appdesigner programmatically? Thanks! Yu

2 years ago | 1 answer | 0

### 1

answerQuestion

anyway to cat specific column using horzcat?

Hi: I have a cell array, the size is not determined, but each array is a 1000*3 matrix. I want to merge the 3rd colu...

2 years ago | 2 answers | 0

### 2

answersQuestion

anyway to get list of linestyle in uiaxes of app

Hi: I have an UIAxes in app and I need the list of line style of it, the command I use is: lineStyle=app.UIAxes.LineStyleO...

2 years ago | 1 answer | 0

### 1

answerQuestion

anyway to clear variable in Matlab workspace from app?

Hi: is there anyway to clear variable in Matlab workspace from app designer? an workaround I know is to use 'assign...

2 years ago | 2 answers | 0

### 2

answersQuestion

how to get index of selected item in listbox of appdesginer

Hi: I want to get the index of selected item in listbox of appdesigner. I found a solution here: https://www.mathwor...

2 years ago | 2 answers | 0

### 2

answersQuestion

anyway to close cftool programmatically

Hi: is there anyway to close cftool programmatically? Thanks! Yu

2 years ago | 1 answer | 1

### 1

answerQuestion

anyway to transfer data from matlab workspace to appdesigner

Hi: I want to develop an app based on the data in the workspace. is there anyway to do it like 'cftool'? i.e. once I open t...

3 years ago | 1 answer | 1

### 1

answerQuestion

cprintf not work in linux command window

Hi: I noticed that function 'cpirntf' does not work in Linux command window, below is what I did: 1. open a command wi...

3 years ago | 1 answer | 0

### 1

answerQuestion

how to show selection of property using 'Tab' in self-developed function

Hi: I see for some Matlab function, such as 'colorbar', if I want to pick an location, I can use 'TAB' and some selection ...

3 years ago | 1 answer | 0

### 1

answerQuestion

question regarding 'copyfile' function from folder to folder

Hi: I tried to use 'coypfile' function from folder to folder. assuming I have file a.txt, b.txt in folder 'A', and ...

3 years ago | 1 answer | 0

### 1

answerQuestion

operation problem after use 'qlogin' in linux system

Hi: in the linux system, I log into a node and want to check the cores available for parallel computing, below is my code: ...

3 years ago | 0 answers | 0

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answersQuestion

anyway to read value of color column using data cursor

Hi: I have a scatter points x and y, and I colored them with c, below is the test code: [X,Y] = meshgrid(1:0.5:10,1:20); ...

3 years ago | 0 answers | 0

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answersQuestion

any way to add legend in bar plot like this?

Hi: is there anyway to add legend of a bar plot like below? i.e. put the bar plot on the left side and the legend on the ri...

3 years ago | 1 answer | 0

### 1

answerQuestion

set editField 'invisible' in app-designer problem

Hi: I have a set of editField and I want to set them into 'invisible', the original display looks like below: ...

3 years ago | 1 answer | 0

### 1

answerQuestion

cell part not saved using '-struct' option

Hi: I have a structure variable 'ImaInfo' like below: then I saved it into disk using '-struct' option, using co...

3 years ago | 0 answers | 0

### 0

answersQuestion

use color bar as item in App-designer drop down list

Hi: I want to update my app-designer to select color, what I have now, is either to use color name ('r','b') or RGB value a...

3 years ago | 1 answer | 0

### 1

answerQuestion

any easier way to find cell by string

Hi: I have a cell array like below: A{1}='test1a'; A{2}='test2a'; A{3}='test3a'; A{4}='test4a'; A...

3 years ago | 1 answer | 0