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summer


9 total contributions since 2014

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Question


what is the initial phase of the signal y=sin(2*pi*x)? zero or -π?
According to the explanation on the internet, the phase of the y=A*sin(2*pi*x+Phi) is 2*pi*x+Phi, and the initial phase is the r...

meer dan 3 jaar ago | 1 answer | 0

1

answer

Question


How to calculate the phase spectrum of the square wave with fft?
there is an article said that the phase spectrum is π or 0. I don't know it's right or not. so i used fft function to check it. ...

meer dan 3 jaar ago | 0 answers | 0

0

answers

Question


the error information when i use fdesign.lowpass to design a filter.
the code: h = fdesign.lowpass('N,F3db,Ap,Ast' ,14, 0.93,0.1,60); the error message is : There is no enumerated value ...

bijna 4 jaar ago | 1 answer | 0

1

answer

Question


How to turn the cursor to a specific value in a big matrix?How to turn the cursor to specific coordinate in a big matrix,e.g. row 50,col 100.
RT, In the workspace, double click a matrix,it can be opened.if the matrix size is very big,e.g. 10000*20000,it is very trouble...

meer dan 4 jaar ago | 0 answers | 0

0

answers

Question


why the imread output result is not same as the input of the imwrite?
if true % code data_test= [1 2 3 4; 2 5 0 6; 4 10 0 3; 5 8 6 14]; imwrite((data_test),'clown.png'); s=imr...

meer dan 4 jaar ago | 1 answer | 0

1

answer

Question


how to show the title in the imtool figure?
I want to add some describtion in the imtool figure.But the describtion can not show up when i use title function. figure, imto...

meer dan 4 jaar ago | 2 answers | 1

2

answers

Question


How to add files to other parallel pool?
when I load a mat file before the parfor circle , I get an error described below. An UndefinedFunction error was thrown on the...

bijna 5 jaar ago | 0 answers | 0

0

answers

Question


how to share multiple variables in different m files?
Now i have two solutions to address the problem. # The one is set all the variables need to share to ouptput variable,and inp...

bijna 5 jaar ago | 2 answers | 0

2

answers

Question


what's the difference in single and float when reading data with fread function.
In the help documation of fread function,there are senven kinds of datatypes which are listed below. single 32 (4) double 64...

bijna 5 jaar ago | 1 answer | 0

1

answer