I have used the following commands to load in a python .pkl file.
fid = py.open("data.pkl");
data = py.pickle.load(fid);
T = table(data);
This loads a python DataFrame object. Newer versions of MATLAB have the ability to convert this object to a table using the table command, which I tried but encountered the below error:
Error using py.pandas.DataFrame/table
Dimensions of the key and value must be the same, or the value must be scalar.
What does this error mean? I’m guessing it’s because the DataFrame object in the .pkl contains a couple nested fields. Most of the fields are simply 1xN numeric vectors, but a couple are 1xN objects which then have their own fields.
How can I convert this DataFrame object to something usable in MATLAB? I was given this datafile and did not generate it, and I am much more proficient in MATLAB than python, so I would rather solve this within MATLAB rather than having to create a python script or change how the file is created.I have used the following commands to load in a python .pkl file.
fid = py.open("data.pkl");
data = py.pickle.load(fid);
T = table(data);
This loads a python DataFrame object. Newer versions of MATLAB have the ability to convert this object to a table using the table command, which I tried but encountered the below error:
Error using py.pandas.DataFrame/table
Dimensions of the key and value must be the same, or the value must be scalar.
What does this error mean? I’m guessing it’s because the DataFrame object in the .pkl contains a couple nested fields. Most of the fields are simply 1xN numeric vectors, but a couple are 1xN objects which then have their own fields.
How can I convert this DataFrame object to something usable in MATLAB? I was given this datafile and did not generate it, and I am much more proficient in MATLAB than python, so I would rather solve this within MATLAB rather than having to create a python script or change how the file is created. I have used the following commands to load in a python .pkl file.
fid = py.open("data.pkl");
data = py.pickle.load(fid);
T = table(data);
This loads a python DataFrame object. Newer versions of MATLAB have the ability to convert this object to a table using the table command, which I tried but encountered the below error:
Error using py.pandas.DataFrame/table
Dimensions of the key and value must be the same, or the value must be scalar.
What does this error mean? I’m guessing it’s because the DataFrame object in the .pkl contains a couple nested fields. Most of the fields are simply 1xN numeric vectors, but a couple are 1xN objects which then have their own fields.
How can I convert this DataFrame object to something usable in MATLAB? I was given this datafile and did not generate it, and I am much more proficient in MATLAB than python, so I would rather solve this within MATLAB rather than having to create a python script or change how the file is created. python, table, dataframe MATLAB Answers — New Questions

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I have a 3D surface surf(X,Y,Z) viewed from view(0,90) with a colorbar which I want to put a title on. The help instructions talk about an lcolorbar, TitleString and ZlabelString but there’s no example and I’m lost.
[X Y]=meshgrid(0:100,0:100);
Z=Y;
surf(X,Y,Z);
view(0,90);
hcb=colorbar;
?????? what next to put a title on the colorbar please ?????
Maybe something like set(get(hcb,’Title’),’cb title’) but I wouldn’t be asking if that worked …
Thanks.I have a 3D surface surf(X,Y,Z) viewed from view(0,90) with a colorbar which I want to put a title on. The help instructions talk about an lcolorbar, TitleString and ZlabelString but there’s no example and I’m lost.
[X Y]=meshgrid(0:100,0:100);
Z=Y;
surf(X,Y,Z);
view(0,90);
hcb=colorbar;
?????? what next to put a title on the colorbar please ?????
Maybe something like set(get(hcb,’Title’),’cb title’) but I wouldn’t be asking if that worked …
Thanks. I have a 3D surface surf(X,Y,Z) viewed from view(0,90) with a colorbar which I want to put a title on. The help instructions talk about an lcolorbar, TitleString and ZlabelString but there’s no example and I’m lost.
[X Y]=meshgrid(0:100,0:100);
Z=Y;
surf(X,Y,Z);
view(0,90);
hcb=colorbar;
?????? what next to put a title on the colorbar please ?????
Maybe something like set(get(hcb,’Title’),’cb title’) but I wouldn’t be asking if that worked …
Thanks. colorbar title surf titlestring MATLAB Answers — New Questions

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I want to install Matlab on my desktop with connection from Network license server . Steps requiredI want to install Matlab on my desktop with connection from Network license server . Steps required I want to install Matlab on my desktop with connection from Network license server . Steps required client installation MATLAB Answers — New Questions

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I have hundreds of RGB images (one of the image is attached). For reference these are interference images and the RGB color values correspond to certain film thickness between a semi reflective glass surface and a steel surface. I apply electric potential across the surface and observed electric discharges which show as bright spots on the image (highlighted in red circle in attached image).
I want to write a script in MATLAB (2023a) that goes through the images, identify these bright spots stores there location in the XY cordinate system. The end goal is to show spatial distribution of the electric discharges.I have hundreds of RGB images (one of the image is attached). For reference these are interference images and the RGB color values correspond to certain film thickness between a semi reflective glass surface and a steel surface. I apply electric potential across the surface and observed electric discharges which show as bright spots on the image (highlighted in red circle in attached image).
I want to write a script in MATLAB (2023a) that goes through the images, identify these bright spots stores there location in the XY cordinate system. The end goal is to show spatial distribution of the electric discharges. I have hundreds of RGB images (one of the image is attached). For reference these are interference images and the RGB color values correspond to certain film thickness between a semi reflective glass surface and a steel surface. I apply electric potential across the surface and observed electric discharges which show as bright spots on the image (highlighted in red circle in attached image).
I want to write a script in MATLAB (2023a) that goes through the images, identify these bright spots stores there location in the XY cordinate system. The end goal is to show spatial distribution of the electric discharges. image analysis, image processing MATLAB Answers — New Questions

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Only version 2026a appears available for download as a trial.
I want version 2025b, but it does not appear as an option at https://www.mathworks.com/downloads/web_downloads/13799194.Only version 2026a appears available for download as a trial.
I want version 2025b, but it does not appear as an option at https://www.mathworks.com/downloads/web_downloads/13799194. Only version 2026a appears available for download as a trial.
I want version 2025b, but it does not appear as an option at https://www.mathworks.com/downloads/web_downloads/13799194. r2025a MATLAB Answers — New Questions

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I’m facing the issue i.e., I’m running the polyspace code prover throught the commend prompt. I used all the configuration in the option.txt file. Through that option.txt file i’m start compling by using this cmd ("C:Program FilesPOLYSPACER2023apolyspacebinpolyspace-code-prover" ^ -options-file Options.txt ^ -scheduler CHE6-SV00106 ^ -results-dir "C:UsersaallimutDocumentsSWEET500cb1146_vcore_main_devResult"). Compliation is done sucessfully and the code is pushed to the server. After successful complition of run I Checked the result, It’s only showing the code metrix, not showing any checks in the dashboard.I’m facing the issue i.e., I’m running the polyspace code prover throught the commend prompt. I used all the configuration in the option.txt file. Through that option.txt file i’m start compling by using this cmd ("C:Program FilesPOLYSPACER2023apolyspacebinpolyspace-code-prover" ^ -options-file Options.txt ^ -scheduler CHE6-SV00106 ^ -results-dir "C:UsersaallimutDocumentsSWEET500cb1146_vcore_main_devResult"). Compliation is done sucessfully and the code is pushed to the server. After successful complition of run I Checked the result, It’s only showing the code metrix, not showing any checks in the dashboard. I’m facing the issue i.e., I’m running the polyspace code prover throught the commend prompt. I used all the configuration in the option.txt file. Through that option.txt file i’m start compling by using this cmd ("C:Program FilesPOLYSPACER2023apolyspacebinpolyspace-code-prover" ^ -options-file Options.txt ^ -scheduler CHE6-SV00106 ^ -results-dir "C:UsersaallimutDocumentsSWEET500cb1146_vcore_main_devResult"). Compliation is done sucessfully and the code is pushed to the server. After successful complition of run I Checked the result, It’s only showing the code metrix, not showing any checks in the dashboard. no checks found MATLAB Answers — New Questions

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The code for the textscatter example at
textscatter – 2-D scatter plot of text – MATLAB
looks like it should produce text at those random points. Instead the figure there shows some text in unusual places, some points that dont belong to any specific label, and in general, the whole thing is mysterious.The code for the textscatter example at
textscatter – 2-D scatter plot of text – MATLAB
looks like it should produce text at those random points. Instead the figure there shows some text in unusual places, some points that dont belong to any specific label, and in general, the whole thing is mysterious. The code for the textscatter example at
textscatter – 2-D scatter plot of text – MATLAB
looks like it should produce text at those random points. Instead the figure there shows some text in unusual places, some points that dont belong to any specific label, and in general, the whole thing is mysterious. textscatter MATLAB Answers — New Questions

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Hello,

I am comparing two control strategies: one with fixed switching frequency and another with variable switching frequency.

Is it acceptable to use different powergui or sample times for each method so that both operate at a similar switching frequency range before comparing torque ripple?

Or should the same sample time always be used for both methods, even if their switching frequencies become very different?

Thank you.Hello,

I am comparing two control strategies: one with fixed switching frequency and another with variable switching frequency.

Is it acceptable to use different powergui or sample times for each method so that both operate at a similar switching frequency range before comparing torque ripple?

Or should the same sample time always be used for both methods, even if their switching frequencies become very different?

Thank you. Hello,

I am comparing two control strategies: one with fixed switching frequency and another with variable switching frequency.

Is it acceptable to use different powergui or sample times for each method so that both operate at a similar switching frequency range before comparing torque ripple?

Or should the same sample time always be used for both methods, even if their switching frequencies become very different?

Thank you. powergui, simulink, sample time, switching frequency MATLAB Answers — New Questions

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I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors?I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors? I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors? precision, digits MATLAB Answers — New Questions

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tic
syms x y m %alpha beta b lambda eta phi
phi=sqrt(0.5)
b=10
eta=1
alpha=2;
beta=1;
T=zeros(1,2,’sym’);
G=zeros(1,2,’sym’);
A=zeros(1,’sym’);
B=zeros(1,’sym’);
C=zeros(1,’sym’);
D=zeros(1,’sym’);
E=zeros(1,’sym’);
F=zeros(1,’sym’);
G_val=zeros(1,’sym’);
series(x)=sym(zeros(1,1));
series1(x)=sym(zeros(1,1));
% Transform Initial condition
T(1)=m;
T(2)=0;
% Initial transform value of exp function

for i=1:4
G(i)=y;
if i==1
E(1)=exp((eta*T(1))/(eta+T(1)));
else
A(1)=0;
for j=1:i-1
E(i)=A(1)+(j/(i-1))*G(j)*E(i-j);
end
B(1)=0;
for j=1:i
B(1)=B(1)+T(j)*G(i-j+1);
end
eq1=G(i)-T(i)+(1/eta)*B(1);
G_val=simplify(solve(eq1,y));
G(i)=simplify(G_val);
E_val=subs(E(i),y,G_val);
E(i)=E_val
end
C(1)=0
for r=1:i
C(1)=C(1)+T(r)*E(i-r+1);
end
T(i + alpha*beta) = (phi^2*C(1)-b*phi^2*E(i))*(gamma(1+(sym(i-1)/beta))/gamma(1+alpha+(sym(i-1)/beta)));
%T(i+2)=simplify((1/(i*(i+1)))*(phi^2*C(1)-b*phi^2*E(i)));
end

for k=1:3
series(x)=simplify(series(x)+T(k)*(power(x,((k-1)*beta))));
end
series
e1=subs(series,x,1);
format long
accuracy=input(‘enter the accuracy’)
f=e1(x)
g=inline(f)
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
while fa*fb>0
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
end
for i=1:50
c=(a+b)/2;
fc=feval(g,c);
disp([i a fa b fb c fc abs(b-a)])
if fc==accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif abs(b-a)<=accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif fa*fc<=0
b=c;
fb=fc;
else
a=c;
fa=fc;
end
end
fprintf(‘the value of c=%f’, c);
series1(x)=subs(series,m,c)
residualError=sym(zeros(1,1));
residual=sym(zeros(1,1));
residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1)))
residual_error=double(subs(residualError,x,0.2))
var =double(residual_error);
x=0:0.1:1
error=zeros(1)
row=0;
for i=1:length(x)
row=row+1;
error(row)=(residualErrorx(i))
max_error=max(error)
end
fprintf(‘The residual error is %fn’, max_error);
%—————————————————————–
the error appear as Error using mupadengine/evalin2double
Unable to convert expression containing symbolic variables into double array. Apply ‘subs’ function first to substitute values for variables.

Error in mupadengine/feval2double

Error in sym/double (line 756)
X = feval2double(symengine, "symobj::doubleDirect", S);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Related documentation
now i substutite the value of m using sysntax series1(x)=subs(series,m,c) but when i later on call series 1 in line residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1))) the final expression is having m and y . That is symbolic and craet an errortic
syms x y m %alpha beta b lambda eta phi
phi=sqrt(0.5)
b=10
eta=1
alpha=2;
beta=1;
T=zeros(1,2,’sym’);
G=zeros(1,2,’sym’);
A=zeros(1,’sym’);
B=zeros(1,’sym’);
C=zeros(1,’sym’);
D=zeros(1,’sym’);
E=zeros(1,’sym’);
F=zeros(1,’sym’);
G_val=zeros(1,’sym’);
series(x)=sym(zeros(1,1));
series1(x)=sym(zeros(1,1));
% Transform Initial condition
T(1)=m;
T(2)=0;
% Initial transform value of exp function

for i=1:4
G(i)=y;
if i==1
E(1)=exp((eta*T(1))/(eta+T(1)));
else
A(1)=0;
for j=1:i-1
E(i)=A(1)+(j/(i-1))*G(j)*E(i-j);
end
B(1)=0;
for j=1:i
B(1)=B(1)+T(j)*G(i-j+1);
end
eq1=G(i)-T(i)+(1/eta)*B(1);
G_val=simplify(solve(eq1,y));
G(i)=simplify(G_val);
E_val=subs(E(i),y,G_val);
E(i)=E_val
end
C(1)=0
for r=1:i
C(1)=C(1)+T(r)*E(i-r+1);
end
T(i + alpha*beta) = (phi^2*C(1)-b*phi^2*E(i))*(gamma(1+(sym(i-1)/beta))/gamma(1+alpha+(sym(i-1)/beta)));
%T(i+2)=simplify((1/(i*(i+1)))*(phi^2*C(1)-b*phi^2*E(i)));
end

for k=1:3
series(x)=simplify(series(x)+T(k)*(power(x,((k-1)*beta))));
end
series
e1=subs(series,x,1);
format long
accuracy=input(‘enter the accuracy’)
f=e1(x)
g=inline(f)
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
while fa*fb>0
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
end
for i=1:50
c=(a+b)/2;
fc=feval(g,c);
disp([i a fa b fb c fc abs(b-a)])
if fc==accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif abs(b-a)<=accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif fa*fc<=0
b=c;
fb=fc;
else
a=c;
fa=fc;
end
end
fprintf(‘the value of c=%f’, c);
series1(x)=subs(series,m,c)
residualError=sym(zeros(1,1));
residual=sym(zeros(1,1));
residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1)))
residual_error=double(subs(residualError,x,0.2))
var =double(residual_error);
x=0:0.1:1
error=zeros(1)
row=0;
for i=1:length(x)
row=row+1;
error(row)=(residualErrorx(i))
max_error=max(error)
end
fprintf(‘The residual error is %fn’, max_error);
%—————————————————————–
the error appear as Error using mupadengine/evalin2double
Unable to convert expression containing symbolic variables into double array. Apply ‘subs’ function first to substitute values for variables.

Error in mupadengine/feval2double

Error in sym/double (line 756)
X = feval2double(symengine, "symobj::doubleDirect", S);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Related documentation
now i substutite the value of m using sysntax series1(x)=subs(series,m,c) but when i later on call series 1 in line residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1))) the final expression is having m and y . That is symbolic and craet an error tic
syms x y m %alpha beta b lambda eta phi
phi=sqrt(0.5)
b=10
eta=1
alpha=2;
beta=1;
T=zeros(1,2,’sym’);
G=zeros(1,2,’sym’);
A=zeros(1,’sym’);
B=zeros(1,’sym’);
C=zeros(1,’sym’);
D=zeros(1,’sym’);
E=zeros(1,’sym’);
F=zeros(1,’sym’);
G_val=zeros(1,’sym’);
series(x)=sym(zeros(1,1));
series1(x)=sym(zeros(1,1));
% Transform Initial condition
T(1)=m;
T(2)=0;
% Initial transform value of exp function

for i=1:4
G(i)=y;
if i==1
E(1)=exp((eta*T(1))/(eta+T(1)));
else
A(1)=0;
for j=1:i-1
E(i)=A(1)+(j/(i-1))*G(j)*E(i-j);
end
B(1)=0;
for j=1:i
B(1)=B(1)+T(j)*G(i-j+1);
end
eq1=G(i)-T(i)+(1/eta)*B(1);
G_val=simplify(solve(eq1,y));
G(i)=simplify(G_val);
E_val=subs(E(i),y,G_val);
E(i)=E_val
end
C(1)=0
for r=1:i
C(1)=C(1)+T(r)*E(i-r+1);
end
T(i + alpha*beta) = (phi^2*C(1)-b*phi^2*E(i))*(gamma(1+(sym(i-1)/beta))/gamma(1+alpha+(sym(i-1)/beta)));
%T(i+2)=simplify((1/(i*(i+1)))*(phi^2*C(1)-b*phi^2*E(i)));
end

for k=1:3
series(x)=simplify(series(x)+T(k)*(power(x,((k-1)*beta))));
end
series
e1=subs(series,x,1);
format long
accuracy=input(‘enter the accuracy’)
f=e1(x)
g=inline(f)
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
while fa*fb>0
a=input(‘enter the ist approximation=’)
b=input(‘enter the 2nd approximation=’)
fa=feval(g,a)
fb=feval(g,b)
end
for i=1:50
c=(a+b)/2;
fc=feval(g,c);
disp([i a fa b fb c fc abs(b-a)])
if fc==accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif abs(b-a)<=accuracy
fprintf(‘the root of the equation is %f’,c)
break;
elseif fa*fc<=0
b=c;
fb=fc;
else
a=c;
fa=fc;
end
end
fprintf(‘the value of c=%f’, c);
series1(x)=subs(series,m,c)
residualError=sym(zeros(1,1));
residual=sym(zeros(1,1));
residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1)))
residual_error=double(subs(residualError,x,0.2))
var =double(residual_error);
x=0:0.1:1
error=zeros(1)
row=0;
for i=1:length(x)
row=row+1;
error(row)=(residualErrorx(i))
max_error=max(error)
end
fprintf(‘The residual error is %fn’, max_error);
%—————————————————————–
the error appear as Error using mupadengine/evalin2double
Unable to convert expression containing symbolic variables into double array. Apply ‘subs’ function first to substitute values for variables.

Error in mupadengine/feval2double

Error in sym/double (line 756)
X = feval2double(symengine, "symobj::doubleDirect", S);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Related documentation
now i substutite the value of m using sysntax series1(x)=subs(series,m,c) but when i later on call series 1 in line residualError(x) = abs(diff(series1,x,2)+ B*phi^2*(1-(series1)/B)*exp((eta*series1)/(eta+series1))) the final expression is having m and y . That is symbolic and craet an error symbolic compuational MATLAB Answers — New Questions

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