rlocus() - Not enough input arguments in MATLAB 2018a
I am following this tutorial on root locus methods and when writing:
syms s
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys)
I get:
Error using rlocus
Not enough input arguments.
Why is rlocus expecting more input arguments when the documentation states that one input argument is enough?
rlocus(SYS) computes and plots the root locus of the single-input,
single-output LTI model SYS. The root locus plot is used to analyze
the negative feedback loop
Syntax for rlocus:
rlocus(sys)
rlocus(sys1,sys2,...)
[r,k] = rlocus(sys)
r = rlocus(sys,k)
matlab
asked Dec 27 at 14:19
Rrz0
485518
|
show 6 more comments
I am following this tutorial on root locus methods and when writing:
syms s
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys)
I get:
Error using rlocus
Not enough input arguments.
Why is rlocus expecting more input arguments when the documentation states that one input argument is enough?
rlocus(SYS) computes and plots the root locus of the single-input,
single-output LTI model SYS. The root locus plot is used to analyze
the negative feedback loop
Syntax for rlocus:
rlocus(sys)
rlocus(sys1,sys2,...)
[r,k] = rlocus(sys)
r = rlocus(sys,k)
matlab
asked Dec 27 at 14:19
Rrz0
485518
Did you re-define the function? Typewhich rlocusand see if the result is a function within the MATLAB toolbox.
– Cris Luengo
Dec 27 at 14:31
Thanks for your comment. No I did not re-define the function -...Program FilesMATLABR2018atoolboxcontrolctrlobsoleterlocus.m. Strangely it is in theobsoletefolder.
– Rrz0
Dec 27 at 14:33
Strange indeed. Doeswhich rlocus(sys)return the same thing?
– Cris Luengo
Dec 27 at 14:42
The documentation link is likely a method of a transfer function object. It may not support symbolic functions. Your call might have reached the obsolete rlocus function which might have operated differently and expects more inputs.
– Navan
Dec 27 at 14:52
@CrisLuengo, yes it does.
– Rrz0
Dec 27 at 14:52
|
show 6 more comments
I am following this tutorial on root locus methods and when writing:
syms s
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys)
I get:
Error using rlocus
Not enough input arguments.
Why is rlocus expecting more input arguments when the documentation states that one input argument is enough?
rlocus(SYS) computes and plots the root locus of the single-input,
single-output LTI model SYS. The root locus plot is used to analyze
the negative feedback loop
Syntax for rlocus:
rlocus(sys)
rlocus(sys1,sys2,...)
[r,k] = rlocus(sys)
r = rlocus(sys,k)
matlab
asked Dec 27 at 14:19
Rrz0
485518
I am following this tutorial on root locus methods and when writing:
syms s
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys)
I get:
Error using rlocus
Not enough input arguments.
Why is rlocus expecting more input arguments when the documentation states that one input argument is enough?
rlocus(SYS) computes and plots the root locus of the single-input,
single-output LTI model SYS. The root locus plot is used to analyze
the negative feedback loop
Syntax for rlocus:
rlocus(sys)
rlocus(sys1,sys2,...)
[r,k] = rlocus(sys)
r = rlocus(sys,k)
matlab
matlab
asked Dec 27 at 14:19
Rrz0
485518
asked Dec 27 at 14:19
Rrz0
485518
asked Dec 27 at 14:19
Rrz0
485518
asked Dec 27 at 14:19
Rrz0
485518
asked Dec 27 at 14:19
Rrz0
485518
485518
Did you re-define the function? Typewhich rlocusand see if the result is a function within the MATLAB toolbox.
– Cris Luengo
Dec 27 at 14:31
Thanks for your comment. No I did not re-define the function -...Program FilesMATLABR2018atoolboxcontrolctrlobsoleterlocus.m. Strangely it is in theobsoletefolder.
– Rrz0
Dec 27 at 14:33
Strange indeed. Doeswhich rlocus(sys)return the same thing?
– Cris Luengo
Dec 27 at 14:42
The documentation link is likely a method of a transfer function object. It may not support symbolic functions. Your call might have reached the obsolete rlocus function which might have operated differently and expects more inputs.
– Navan
Dec 27 at 14:52
@CrisLuengo, yes it does.
– Rrz0
Dec 27 at 14:52
|
show 6 more comments
Did you re-define the function? Typewhich rlocusand see if the result is a function within the MATLAB toolbox.
– Cris Luengo
Dec 27 at 14:31
Thanks for your comment. No I did not re-define the function -...Program FilesMATLABR2018atoolboxcontrolctrlobsoleterlocus.m. Strangely it is in theobsoletefolder.
– Rrz0
Dec 27 at 14:33
Strange indeed. Doeswhich rlocus(sys)return the same thing?
– Cris Luengo
Dec 27 at 14:42
The documentation link is likely a method of a transfer function object. It may not support symbolic functions. Your call might have reached the obsolete rlocus function which might have operated differently and expects more inputs.
– Navan
Dec 27 at 14:52
@CrisLuengo, yes it does.
– Rrz0
Dec 27 at 14:52
Did you re-define the function? Type
which rlocus and see if the result is a function within the MATLAB toolbox.– Cris Luengo
Dec 27 at 14:31
Did you re-define the function? Type
which rlocus and see if the result is a function within the MATLAB toolbox.– Cris Luengo
Dec 27 at 14:31
Thanks for your comment. No I did not re-define the function -
...Program FilesMATLABR2018atoolboxcontrolctrlobsoleterlocus.m. Strangely it is in the obsolete folder.– Rrz0
Dec 27 at 14:33
Thanks for your comment. No I did not re-define the function -
...Program FilesMATLABR2018atoolboxcontrolctrlobsoleterlocus.m. Strangely it is in the obsolete folder.– Rrz0
Dec 27 at 14:33
Strange indeed. Does
which rlocus(sys) return the same thing?– Cris Luengo
Dec 27 at 14:42
Strange indeed. Does
which rlocus(sys) return the same thing?– Cris Luengo
Dec 27 at 14:42
The documentation link is likely a method of a transfer function object. It may not support symbolic functions. Your call might have reached the obsolete rlocus function which might have operated differently and expects more inputs.
– Navan
Dec 27 at 14:52
The documentation link is likely a method of a transfer function object. It may not support symbolic functions. Your call might have reached the obsolete rlocus function which might have operated differently and expects more inputs.
– Navan
Dec 27 at 14:52
@CrisLuengo, yes it does.
– Rrz0
Dec 27 at 14:52
@CrisLuengo, yes it does.
– Rrz0
Dec 27 at 14:52
|
show 6 more comments
1 Answer
1
active
oldest
votes
You are supposed to input a transfer function to rlocus not a symbolic variable. The code you provided gave me the same error but this worked just fine
s=tf('s');
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys);
answered Dec 27 at 17:54
Nirvedh Meshram
329112
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You are supposed to input a transfer function to rlocus not a symbolic variable. The code you provided gave me the same error but this worked just fine
s=tf('s');
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys);
answered Dec 27 at 17:54
Nirvedh Meshram
329112
add a comment |
You are supposed to input a transfer function to rlocus not a symbolic variable. The code you provided gave me the same error but this worked just fine
s=tf('s');
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys);
answered Dec 27 at 17:54
Nirvedh Meshram
329112
add a comment |
You are supposed to input a transfer function to rlocus not a symbolic variable. The code you provided gave me the same error but this worked just fine
s=tf('s');
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys);
answered Dec 27 at 17:54
Nirvedh Meshram
329112
You are supposed to input a transfer function to rlocus not a symbolic variable. The code you provided gave me the same error but this worked just fine
s=tf('s');
sys = 1/(3*s^2 + 2*s - 1);
rlocus(sys);
answered Dec 27 at 17:54
Nirvedh Meshram
329112
answered Dec 27 at 17:54
Nirvedh Meshram
329112
answered Dec 27 at 17:54
Nirvedh Meshram
329112
answered Dec 27 at 17:54
Nirvedh Meshram
329112
329112
add a comment |
add a comment |
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Did you re-define the function? Type
which rlocusand see if the result is a function within the MATLAB toolbox.– Cris Luengo
Dec 27 at 14:31
Thanks for your comment. No I did not re-define the function -
...Program FilesMATLABR2018atoolboxcontrolctrlobsoleterlocus.m. Strangely it is in theobsoletefolder.– Rrz0
Dec 27 at 14:33
Strange indeed. Does
which rlocus(sys)return the same thing?– Cris Luengo
Dec 27 at 14:42
The documentation link is likely a method of a transfer function object. It may not support symbolic functions. Your call might have reached the obsolete rlocus function which might have operated differently and expects more inputs.
– Navan
Dec 27 at 14:52
@CrisLuengo, yes it does.
– Rrz0
Dec 27 at 14:52