Fangjun Jiang

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3,114 total contributions since 2011

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Professional Interests: Model-Based Development

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Answered
How do I get index matrix for matrix of values?
>> [Row,Column]=ind2sub([3,3],1:9) Row = 1 2 3 1 2 3 1 2 3 Column = 1 1 1 ...

3 days ago | 1

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How to delete empty files/spreadsheets in a directory ?
run [STATUS,SHEETS] = xlsfinfo(FILENAME). Most likely, it will tell you there is only one sheet run [NUM,TXT,RAW]=xlsread(FILEN...

4 days ago | 0

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How to use external simulation time in simulink?
USE "XY Graph" block. X is the received time, Y is the received data.

4 days ago | 0

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how to sum vector with simulink sum block
Just use the good old Sum block. Give one Constant block, specify value as [1 2 3] and another Constant block [10 20 33], Sum to...

7 days ago | 0

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Access programmatically to EnumTypeDefinition in Simulink Data Dictionary
out=getValue(enumerationType) info=out.Enumerals info.Name

10 days ago | 0

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Is there a command to close all the tabs?
Starting from gcs, you can do this. The tab for the root level model would be kept open. The tabs for other models are also not ...

11 days ago | 0

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Sum subarrays of a Matrix.
One-liner transpose(reshape(sum(reshape(A',3,[])),3,[])) Or transpose(cell2mat(cellfun(@sum,mat2cell(A',[3,3,3],3),'unif',0))...

11 days ago | 1

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Struct contents reference from a non-struct array object.
In your code, variable "filename" is a string. It does not have the structure field ".name". If your code looks like this, then...

12 days ago | 1

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Simulink Clock (time) reset?
Feed Constant value 1 to an integrator, the output is the time. Wrap the state of the Integrator to 5400 and 0.

12 days ago | 0

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Searching structure that has all caps field names with list that varies in case.
for iVar=1:numel(myVars) b_sp = b_struct.dArray.(upper(myVars{iVar})); end

13 days ago | 1

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combine matrix in matlab
reshape([A;B],1,[])

13 days ago | 0

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Variables scope in MatLab function block
Use "Edit Data" in the MATLAB Function Editor to specify those base workspace variables as the parameters

14 days ago | 0

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Naming Excel Sheet with xlswrite.
FileName=['Rule',num2str(x)] FileName=sprintf('Rule%d',x)

17 days ago | 1

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Why, when doing a for loop to form a column from an array, does it give me 0 values except for the last element?
most likely, change to Lo(I+3*(Q-1),1)=IncECEF(Q,I) And do you know this? A=magic(5); B=A' C=B(:)

18 days ago | 1

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Answered
How to plot two arrays which different time stamps and lengths in one plot?
%% A=[0.1 0.2 0.35 0.42]; B=[1 4 9 12]; C=[0.01 0.4 0.5 0.8 1 2 10]; D=[5 7 10 11 12 3 1]; [x,index]=sort([A,C]); y=[B,D...

18 days ago | 0

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How to update new annotations or descriptions done in a library subsystem into the model where the library is used
To be clear, the annotation needs to be inside a subsystem block in the library. Then after you updated the annotation in the li...

18 days ago | 0

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issues connecting my from workshop block to the PSS and SPS Converter block
In your diagram with error red line, on the top left, you need a Simulink to Physical System converter, not Physical System to S...

18 days ago | 0

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How to plot two different 3D graphics together?
The command "figure" creates a new figure. Use just one of them, and run "hold on".

19 days ago | 0

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How many Workspace's we have in MATLAB ?
Another common one is the function workspace, which is created when the function is entered and destroyed when the function is e...

19 days ago | 0

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extracting values from a matrix or vector
b=a([2,5]), second and fifth element

19 days ago | 1

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If statements comparing two character strings with multiple inputs
variable 'str1' and 'str2' are supposed to take values from function input arguments when you call h20_props(50,"nu","SI"). But ...

20 days ago | 0

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How to get the string form of an anonymous function?
f = @(x) exp(-0.5*x); >> func2str(f) ans = '@(x)exp(-0.5*x)' Or, provide your string, use str2func()

20 days ago | 1

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How to determine the moment (time) at which the signal exceeded the set value in simulink?
Assume you build your model correctly, your signal varies as time goes. Compare your signal with the Constant value, its output ...

21 days ago | 0

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How to change Simulink model line thikness
No. You can't. Simulink is a graphical modeling tool, but not a graph tool. Use something else such as Visio, or Shapes in MS Of...

25 days ago | 0

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Add one port to a Simulink block, from command line AND automaticaly keep the same distance between ports
I dealt with this problem before. There is no quick or automatic way but the following method worked for me to keep the existing...

25 days ago | 0

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Answered
Operator '==' is not supported for operands of type 'tf'
The reason: When you click "cancel" in the inputdlg(), your variable "tf" is not evaluated. When the second part of the code i...

26 days ago | 0

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why do i get the error 'undefined function or variable ' for simin from workspace
When you use "From Workspace" block, it expects the variable "simin" exists in the base workspace. Create that variable to elimi...

26 days ago | 0

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Answered
Transform a matrix in a special way
B=zeros(5); B(tril(true(5),-1))=A B=B'

26 days ago | 1

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Coding philosophy : Is using global goto like using a global variable?
The simple answer is YES. What you see in C code is a code flow. The code is executed in sequence. What you see in Simulink is...

28 days ago | 0

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Answered
Is there a way to limit automatic Y or X axis scaling?
ylim('auto')

28 days ago | 0