Hi, I have a quiver plot where the arrow heads are incredibly wide by default, so I used "MaxHeadSize" to shrink them to a reasonable size. Also, the scaling behavior is set to 0 because I want them to connect the way they do currently. The downside is that now, instead of looking like arrowheads, they almost look like horizontal bars. I’m wondering if there is a way to control the head length independently of the head width.Hi, I have a quiver plot where the arrow heads are incredibly wide by default, so I used "MaxHeadSize" to shrink them to a reasonable size. Also, the scaling behavior is set to 0 because I want them to connect the way they do currently. The downside is that now, instead of looking like arrowheads, they almost look like horizontal bars. I’m wondering if there is a way to control the head length independently of the head width. Hi, I have a quiver plot where the arrow heads are incredibly wide by default, so I used "MaxHeadSize" to shrink them to a reasonable size. Also, the scaling behavior is set to 0 because I want them to connect the way they do currently. The downside is that now, instead of looking like arrowheads, they almost look like horizontal bars. I’m wondering if there is a way to control the head length independently of the head width. quiver, matlab, graph MATLAB Answers — New Questions

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I’m not well versed in matlab at all so hopefully this post makes some sense.
I have tons of data in .txt files that I want to plot. However the only "x" data set that I have is the real life time which I can’t use in my plot(x,y) command since the numbers are 10:23:55, for example. Since the x-axis is just time,I want to make a generic x dataset with a command with which the x gets the same length as the y data sets. Hopefully someone can help me with thisI’m not well versed in matlab at all so hopefully this post makes some sense.
I have tons of data in .txt files that I want to plot. However the only "x" data set that I have is the real life time which I can’t use in my plot(x,y) command since the numbers are 10:23:55, for example. Since the x-axis is just time,I want to make a generic x dataset with a command with which the x gets the same length as the y data sets. Hopefully someone can help me with this I’m not well versed in matlab at all so hopefully this post makes some sense.
I have tons of data in .txt files that I want to plot. However the only "x" data set that I have is the real life time which I can’t use in my plot(x,y) command since the numbers are 10:23:55, for example. Since the x-axis is just time,I want to make a generic x dataset with a command with which the x gets the same length as the y data sets. Hopefully someone can help me with this plotting MATLAB Answers — New Questions

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I tested the following code:
x = rand(1,3);
x([1,2]:[1,2])
In R2024a it gives a warning but it is ok in R2023b! Some existing code that I use relies on this feature. Any reason why it will become an error in the future?
For a better example of how using non-scalar colon operands may be useful:
clear,clc
Params.agejshifter.College=21;
Params.J.College=100-Params.agejshifter.College;
Params.agej.College=1:1:Params.J.College;
Params.J.College=100-Params.agejshifter.College; % Age ends at 100
dj_temp=interp1([0,30,60,65,70,100],[0.00587,0.00116,0.01086,0.01753,0.02785,0.39134],0:1:100,’linear’);
Params.sj.College=1-dj_temp((Params.agej.College+Params.agejshifter.College):100);I tested the following code:
x = rand(1,3);
x([1,2]:[1,2])
In R2024a it gives a warning but it is ok in R2023b! Some existing code that I use relies on this feature. Any reason why it will become an error in the future?
For a better example of how using non-scalar colon operands may be useful:
clear,clc
Params.agejshifter.College=21;
Params.J.College=100-Params.agejshifter.College;
Params.agej.College=1:1:Params.J.College;
Params.J.College=100-Params.agejshifter.College; % Age ends at 100
dj_temp=interp1([0,30,60,65,70,100],[0.00587,0.00116,0.01086,0.01753,0.02785,0.39134],0:1:100,’linear’);
Params.sj.College=1-dj_temp((Params.agej.College+Params.agejshifter.College):100); I tested the following code:
x = rand(1,3);
x([1,2]:[1,2])
In R2024a it gives a warning but it is ok in R2023b! Some existing code that I use relies on this feature. Any reason why it will become an error in the future?
For a better example of how using non-scalar colon operands may be useful:
clear,clc
Params.agejshifter.College=21;
Params.J.College=100-Params.agejshifter.College;
Params.agej.College=1:1:Params.J.College;
Params.J.College=100-Params.agejshifter.College; % Age ends at 100
dj_temp=interp1([0,30,60,65,70,100],[0.00587,0.00116,0.01086,0.01753,0.02785,0.39134],0:1:100,’linear’);
Params.sj.College=1-dj_temp((Params.agej.College+Params.agejshifter.College):100); colon, array indexing MATLAB Answers — New Questions

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The heatmap figures I used to plot on Matlab had the values labeled in each cell (just like the documenation says), but now the figure doesn’t include the text. I’m not sure if I made changes to some settings. Does anyone know what the issue is?
For instance, I get the correct output here, when I run the following on web.
figure
heatmap(magic(5)); colormap(sky)
But this is what I get when I run this locally on my computer.

** EDIT: I run 2024aThe heatmap figures I used to plot on Matlab had the values labeled in each cell (just like the documenation says), but now the figure doesn’t include the text. I’m not sure if I made changes to some settings. Does anyone know what the issue is?
For instance, I get the correct output here, when I run the following on web.
figure
heatmap(magic(5)); colormap(sky)
But this is what I get when I run this locally on my computer.

** EDIT: I run 2024a The heatmap figures I used to plot on Matlab had the values labeled in each cell (just like the documenation says), but now the figure doesn’t include the text. I’m not sure if I made changes to some settings. Does anyone know what the issue is?
For instance, I get the correct output here, when I run the following on web.
figure
heatmap(magic(5)); colormap(sky)
But this is what I get when I run this locally on my computer.

** EDIT: I run 2024a heatmap, labels MATLAB Answers — New Questions

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I have a sparse m x m square matrix L (which is actually a Laplacian matrix of a large graph) and an m x1 vector d. I want to create a diaognal matrix D whose diagonal is populated with the entries in d and then generate
normL = D * L * D
Currently, I am creating a sparse diaognal matrix as
D = spdiags(d, 0, m, m)
and then I use D * L * D.
I wonder whether there is a more efficient way to do this given that the (i, j)-th elements of normL and L are related by
normL(i, j) = D(i) * D(j) * L(i, j).
Thank you very much.I have a sparse m x m square matrix L (which is actually a Laplacian matrix of a large graph) and an m x1 vector d. I want to create a diaognal matrix D whose diagonal is populated with the entries in d and then generate
normL = D * L * D
Currently, I am creating a sparse diaognal matrix as
D = spdiags(d, 0, m, m)
and then I use D * L * D.
I wonder whether there is a more efficient way to do this given that the (i, j)-th elements of normL and L are related by
normL(i, j) = D(i) * D(j) * L(i, j).
Thank you very much. I have a sparse m x m square matrix L (which is actually a Laplacian matrix of a large graph) and an m x1 vector d. I want to create a diaognal matrix D whose diagonal is populated with the entries in d and then generate
normL = D * L * D
Currently, I am creating a sparse diaognal matrix as
D = spdiags(d, 0, m, m)
and then I use D * L * D.
I wonder whether there is a more efficient way to do this given that the (i, j)-th elements of normL and L are related by
normL(i, j) = D(i) * D(j) * L(i, j).
Thank you very much. sparse diagonal matrix, sparse matrix multiplication MATLAB Answers — New Questions

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Hi,
I’m completly new to Matlabs.
I’m trying to load my buildings into the siteviewer, to create a rf propagation in the end.
But I just can’t get my buildings to load. My features are in a esri .gdb an in the coordinate system is WGS_1984.
The features are 3d buildings and are of the type esrie multipatch. The level of detail is only 1, so LOD1 (building blocks without roof).

Code to load:
geo = readgeotable("D:Arbeit3D_Ausleuchtung3D_AusleuchtungDatenDaten_1.gdb", CoordinateSystemType="geographic");

viewer = siteviewer(Buildings=geo, Basemap="topographic");
If I try to load these into the siteviewer I get the following error:
"Error using siteviewer
The coordinates of the input points must be finite values; Inf and NaN are not permitted."
I tried converting the features to kmz an import them, but the error is still the same.

I managed to load the sideviewer with only one feature out of my buildings. So some features are OK, some not to import into sideviewer.
All my features are fine in other gis, like arcgis pro or qgis.
But the one building I can load is floating, I don’t know if this is beacause no terrain moddel is loaded or if there is a property to map them to the ground.

Can anyone help me or give me a hint in the right direction?
thanks, sebastianHi,
I’m completly new to Matlabs.
I’m trying to load my buildings into the siteviewer, to create a rf propagation in the end.
But I just can’t get my buildings to load. My features are in a esri .gdb an in the coordinate system is WGS_1984.
The features are 3d buildings and are of the type esrie multipatch. The level of detail is only 1, so LOD1 (building blocks without roof).

Code to load:
geo = readgeotable("D:Arbeit3D_Ausleuchtung3D_AusleuchtungDatenDaten_1.gdb", CoordinateSystemType="geographic");

viewer = siteviewer(Buildings=geo, Basemap="topographic");
If I try to load these into the siteviewer I get the following error:
"Error using siteviewer
The coordinates of the input points must be finite values; Inf and NaN are not permitted."
I tried converting the features to kmz an import them, but the error is still the same.

I managed to load the sideviewer with only one feature out of my buildings. So some features are OK, some not to import into sideviewer.
All my features are fine in other gis, like arcgis pro or qgis.
But the one building I can load is floating, I don’t know if this is beacause no terrain moddel is loaded or if there is a property to map them to the ground.

Can anyone help me or give me a hint in the right direction?
thanks, sebastian Hi,
I’m completly new to Matlabs.
I’m trying to load my buildings into the siteviewer, to create a rf propagation in the end.
But I just can’t get my buildings to load. My features are in a esri .gdb an in the coordinate system is WGS_1984.
The features are 3d buildings and are of the type esrie multipatch. The level of detail is only 1, so LOD1 (building blocks without roof).

Code to load:
geo = readgeotable("D:Arbeit3D_Ausleuchtung3D_AusleuchtungDatenDaten_1.gdb", CoordinateSystemType="geographic");

viewer = siteviewer(Buildings=geo, Basemap="topographic");
If I try to load these into the siteviewer I get the following error:
"Error using siteviewer
The coordinates of the input points must be finite values; Inf and NaN are not permitted."
I tried converting the features to kmz an import them, but the error is still the same.

I managed to load the sideviewer with only one feature out of my buildings. So some features are OK, some not to import into sideviewer.
All my features are fine in other gis, like arcgis pro or qgis.
But the one building I can load is floating, I don’t know if this is beacause no terrain moddel is loaded or if there is a property to map them to the ground.

Can anyone help me or give me a hint in the right direction?
thanks, sebastian geo, geopolyshape, antenna, gdb, readgeotable MATLAB Answers — New Questions

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I want to send data from Python to MATLAB every 10 seconds via TCP. The code I have works for the first iteration of the loop, but on the second iteration we reestablish the connection, yet the data fails to send.

The relevant Python code is:

import socket
import sys
import time

%Create a TCP/IP socket
i = 0 %loop counter
j=45.395 %data to be sent to MATLAB
while i < 1000:
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((‘localhost’, 51001))
s.listen(1)
conn, addr = s.accept()
print(f"Connected by {addr}")
conn.sendall(bytes(str(j), ‘ASCII’))
conn.close()

i+=1
j+=0.6
time.sleep(10)

The MATLAB code is

i=0;
while i < 1000
t = tcpclient(‘localhost’, 51001);
output = read(t);
data = char(output(1:4));
pwrcmd = str2double(data);
fprintf(‘%f’, pwrcmd);
clear t;
i = i+1;
pause(10)
end

and finally the output on the terminal is:

>python matlab_connect_test.py
Connected by (‘127.0.0.1’, 56010)
Connected by (‘127.0.0.1’, 56012)

The first thing I tried was to establish just one server-client connection, and send data every 10 seconds through that one connection, rather than reconnecting every 10 seconds. That was unsuccessful. For some reason even though the second connection is established, MATLAB never receives the second value of j, or any subsequent values. Any help would be very much appreciated.I want to send data from Python to MATLAB every 10 seconds via TCP. The code I have works for the first iteration of the loop, but on the second iteration we reestablish the connection, yet the data fails to send.

The relevant Python code is:

import socket
import sys
import time

%Create a TCP/IP socket
i = 0 %loop counter
j=45.395 %data to be sent to MATLAB
while i < 1000:
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((‘localhost’, 51001))
s.listen(1)
conn, addr = s.accept()
print(f"Connected by {addr}")
conn.sendall(bytes(str(j), ‘ASCII’))
conn.close()

i+=1
j+=0.6
time.sleep(10)

The MATLAB code is

i=0;
while i < 1000
t = tcpclient(‘localhost’, 51001);
output = read(t);
data = char(output(1:4));
pwrcmd = str2double(data);
fprintf(‘%f’, pwrcmd);
clear t;
i = i+1;
pause(10)
end

and finally the output on the terminal is:

>python matlab_connect_test.py
Connected by (‘127.0.0.1’, 56010)
Connected by (‘127.0.0.1’, 56012)

The first thing I tried was to establish just one server-client connection, and send data every 10 seconds through that one connection, rather than reconnecting every 10 seconds. That was unsuccessful. For some reason even though the second connection is established, MATLAB never receives the second value of j, or any subsequent values. Any help would be very much appreciated. I want to send data from Python to MATLAB every 10 seconds via TCP. The code I have works for the first iteration of the loop, but on the second iteration we reestablish the connection, yet the data fails to send.

The relevant Python code is:

import socket
import sys
import time

%Create a TCP/IP socket
i = 0 %loop counter
j=45.395 %data to be sent to MATLAB
while i < 1000:
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((‘localhost’, 51001))
s.listen(1)
conn, addr = s.accept()
print(f"Connected by {addr}")
conn.sendall(bytes(str(j), ‘ASCII’))
conn.close()

i+=1
j+=0.6
time.sleep(10)

The MATLAB code is

i=0;
while i < 1000
t = tcpclient(‘localhost’, 51001);
output = read(t);
data = char(output(1:4));
pwrcmd = str2double(data);
fprintf(‘%f’, pwrcmd);
clear t;
i = i+1;
pause(10)
end

and finally the output on the terminal is:

>python matlab_connect_test.py
Connected by (‘127.0.0.1’, 56010)
Connected by (‘127.0.0.1’, 56012)

The first thing I tried was to establish just one server-client connection, and send data every 10 seconds through that one connection, rather than reconnecting every 10 seconds. That was unsuccessful. For some reason even though the second connection is established, MATLAB never receives the second value of j, or any subsequent values. Any help would be very much appreciated. python, matlab, tcp, tcpclient, server MATLAB Answers — New Questions

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Hi, One of the output of simulink model is complex number represented in fixd point 18 word lenght and 14 fractional length which is then converted into 18 word length and 15 fractional length . how i can convert the real part and imaginary part of complex number into hex number ? in simulinkHi, One of the output of simulink model is complex number represented in fixd point 18 word lenght and 14 fractional length which is then converted into 18 word length and 15 fractional length . how i can convert the real part and imaginary part of complex number into hex number ? in simulink Hi, One of the output of simulink model is complex number represented in fixd point 18 word lenght and 14 fractional length which is then converted into 18 word length and 15 fractional length . how i can convert the real part and imaginary part of complex number into hex number ? in simulink simulink, data type conversion MATLAB Answers — New Questions

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sometimes in the MATLAB command line window, it will occur " Caught "std::exception" Exception message is: Invalid character code sequence detected."sometimes in the MATLAB command line window, it will occur " Caught "std::exception" Exception message is: Invalid character code sequence detected." sometimes in the MATLAB command line window, it will occur " Caught "std::exception" Exception message is: Invalid character code sequence detected." bug, matlab, character coed MATLAB Answers — New Questions

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The code that is failing is captured in the screen shot. Its an error occurring during a malloc() within the function emxInit_real_T().

<</matlabcentral/answers/uploaded_files/116064/exception1.PNG>>

void emxInit_real_T(emxArray_real_T **pEmxArray, int numDimensions)
{
emxArray_real_T *emxArray;
int i;
*pEmxArray = (emxArray_real_T *)malloc(sizeof(emxArray_real_T));
emxArray = *pEmxArray;
emxArray->data = (double *)NULL;
emxArray->numDimensions = numDimensions;
emxArray->size = (int *)malloc((unsigned int)(sizeof(int) * numDimensions));
emxArray->allocatedSize = 0;
emxArray->canFreeData = true;
for (i = 0; i < numDimensions; i++) {
emxArray->size[i] = 0;
}
}The code that is failing is captured in the screen shot. Its an error occurring during a malloc() within the function emxInit_real_T().

<</matlabcentral/answers/uploaded_files/116064/exception1.PNG>>

void emxInit_real_T(emxArray_real_T **pEmxArray, int numDimensions)
{
emxArray_real_T *emxArray;
int i;
*pEmxArray = (emxArray_real_T *)malloc(sizeof(emxArray_real_T));
emxArray = *pEmxArray;
emxArray->data = (double *)NULL;
emxArray->numDimensions = numDimensions;
emxArray->size = (int *)malloc((unsigned int)(sizeof(int) * numDimensions));
emxArray->allocatedSize = 0;
emxArray->canFreeData = true;
for (i = 0; i < numDimensions; i++) {
emxArray->size[i] = 0;
}
} The code that is failing is captured in the screen shot. Its an error occurring during a malloc() within the function emxInit_real_T().

<</matlabcentral/answers/uploaded_files/116064/exception1.PNG>>

void emxInit_real_T(emxArray_real_T **pEmxArray, int numDimensions)
{
emxArray_real_T *emxArray;
int i;
*pEmxArray = (emxArray_real_T *)malloc(sizeof(emxArray_real_T));
emxArray = *pEmxArray;
emxArray->data = (double *)NULL;
emxArray->numDimensions = numDimensions;
emxArray->size = (int *)malloc((unsigned int)(sizeof(int) * numDimensions));
emxArray->allocatedSize = 0;
emxArray->canFreeData = true;
for (i = 0; i < numDimensions; i++) {
emxArray->size[i] = 0;
}
} coder, exception MATLAB Answers — New Questions

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