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# Jan Siegmund

##### Last seen: 3 days ago
32 total contributions since 2020

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Question

Efficient number occurence count
I want to efficiently count the number of occurences of numbers between 1-numel(num) in a Matrix. I came up with two options for...

11 days ago | 3 answers | 1

### 3

How to put cell array in sprintf?
If using multiple different cells: %% Edited % var = {'a','b','c','d','e'}; % num = {1,2,3,4,5}; % s = strjoin(cellfun(@(v...

2 months ago | 0

How to indicate that GUI is busy running?
Users that looked for a waitbar style solution should have a look at https://de.mathworks.com/help/matlab/ref/uiprogressdlg.html...

4 months ago | 0

How to support default parameter in MATLAB FUNCTION ?
The Answers are not up to date. Modern MATLAB supports the arguments Block: function out = foo(in) arguments in(1...

4 months ago | 2

Multiple numerics as one map key / Merge Objects based on parameters
The only keytype which can hold two doubles is the character key type. So one may use char as key type and then simply function...

4 months ago | 0

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Question

Multiple numerics as one map key / Merge Objects based on parameters
I want to use two numerics as a single key for a map to merge similar objects of a class. How can I do that? My class looks lik...

4 months ago | 1 answer | 0

### 1

How do I convert a numerical vector into a comma-delimited string?
Here is another oneliner: strjoin(cellstr(num2str(n')),',') Testing all four types with a script n = randi(100,[1 100]); tic...

4 months ago | 1

How do I limit the values in an array?
There is also a matlab function doing this: A = min(A,1); It takes A if A is the minimum of the two and 1 if 1 is the minimum ...

5 months ago | 0

How to create a checkerboard matrix without inbuilt function.
For an even sized checkerboard: rows = 6; cols = 4; normal = repmat(eye(2,'logical'),[rows/2 cols/2]); % or inverted = repm...

5 months ago | 0

How to write an efficient overloaded subsasgn?
I may have a solution but do not know if this covers all cases: classdef Subsasgntest properties val e...

5 months ago | 0

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Question

How to write an efficient overloaded subsasgn?
I want to write a class which defines subsasgn. The class holds a numeric value val and the subsasgn should target val only. I ...

5 months ago | 1 answer | 0

### 1

combine columns with different lengths to create a matrix
If the input data is a cell array of column vectors, you might consider this: a = {ones(5,1) ones(8,1)}; %test data len = ma...

5 months ago | 0

horzcat different size rows; zero padding
If the input data is a cell array of column vectors, you might consider this: a = {ones(5,1) ones(8,1)}; %test data len = max(...

5 months ago | 0

Regex: How do I match an empty string?
Use regexp(a,'^\$','emptymatch')

6 months ago | 0

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Question

Regex: How do I match an empty string?
Consider the following string: a = ''; How can I match it using regexp?

6 months ago | 1 answer | 0

### 1

Question

Override subsasgn of MATLABs double?
Consider the following statement: x = [1 2;3 4]; y = myclass([5 6]); x(1:2) = y MATLABs default behavior is: x(1:2) = ... r...

6 months ago | 2 answers | 0

### 2

Question

Does MATLAB call the double constructor on a=a+1?
I want to overload the double class and add some properties to it. And i also have to override the plus function. A similar cod...

6 months ago | 1 answer | 0

### 1

[Fixed Point Converter] 1000 bit fraction length at 2^x if x is loaded from .mat file?
A temporary fix is using bitsll as recommended here: For efficient HDL code generation, use the Fixed-Point Designer ...

7 months ago | 0

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Question

[Fixed Point Converter] 1000 bit fraction length at 2^x if x is loaded from .mat file?
I got a problem with code like this in the fixed-point converter: dut_tb.m dut(8); dut.m function out = dut(in) S = cod...

7 months ago | 2 answers | 0

### 2

[HDL Coder] Ridiculous RAM usage + How to activate parallel processing?
This memory usage is not sane and it is the result of not properly optimized MATLAB code for HDL conversion. I tried to run code...

7 months ago | 0

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Odd and even numbers
Fancy answer: m = [1 2 3;4 5 6]; isodd = bitget(m,1) however this is slower as rem

7 months ago | 0

Question

[HDL Coder] Bug: Fixed point converter does not descend into System Objects
Can I somehow tell the fixed point converter to explicitly convert a certain function? This would temporarily fix the following ...

7 months ago | 1 answer | 0

### 1

Question

[HDL Coder] Ridiculous RAM usage + How to activate parallel processing?
On my project, the HDL Coder uses ridiculus amounts of RAM. On my 8GB Windows 10 Notebook, it chews through it until after 3min ...

7 months ago | 1 answer | 0

### 1

[Coder] Which types are supported for constant folding?
I did understand constant folding wrong: I thought one must help the coder as follows: a = coder.const(my_prod(3,2)); , becau...

7 months ago | 0

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Fixed point converter: Ignore code part.
Ignoring a code part in fixed point converter is currenty(R2019b) not supported. Comment out the section as a temporary fix.

7 months ago | 0

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[HDL Coder]: BUG?/ Function Location missing in Error Report -> find variable by name?
As long a the location of error lines is not shown correctly in MATLAB HDL Coder, assign the top function call as a var = cod...

7 months ago | 0

| accepted

Question

[HDL Coder]: BUG?/ Function Location missing in Error Report -> find variable by name?
In HDL Coder, I want to locate, where errors are occuring. But the HTML Report just gives me the Error Location in the top comp...

7 months ago | 3 answers | 0

### 3

running matlab using command line
For R2019 users: -nodisplay & -nodesktop do not exist. Use: matlab -batch "Main; exit"

7 months ago | 3

Question

[Fixed-point converter] Passing constant struct to entry point
I have passed a constant struct to the input of MATLAB HDL Coder.Lets say param.a = 'red' In the code, it is responsible for ch...

7 months ago | 2 answers | 0

### 2

Question

[Coder] Which types are supported for constant folding?
In MATLAB HDL coder I try to do constant folding on the output of a function. The output type is a 1x262144 uint16. The coder ...

7 months ago | 1 answer | 0