Re: [Scilab-users] Polarplot help

2018-01-21 Thread Claus Futtrup 
Hi Rafael, et al.

I now see that - actually - example 2 of the documentation indeed does plot
two graphs. There's no explanation to the example ... sometimes the
documentation for Scilab functions is incredibly hard to read for someone
who doesn't already know in advance.

/Claus

On Sun, Jan 21, 2018 at 1:41 PM, Claus Futtrup  wrote:

> Hi Rafael
>
> Array notation. After Reading your suggestion I looked at the
> documentation of polarplot and this is not explicitly treated, so I missed
> that one. Thank you.
>
> Best regards,
> Claus
>
> On Sun, Jan 21, 2018 at 1:08 PM, Rafael Guerra  > wrote:
>
>> Hi Claus,
>>
>>
>>
>> Regarding your problem of not being able to plot all curves in one go
>> preserving the scales, if I am not mistaken this can be solved by invoking
>> polarplot with a single call using array notation.
>>
>> See example here below with 2 curves for simplicity:
>>
>>
>>
>> *// START OF CODE*
>>
>> *clf*
>>
>> t = 0:0.01:2*%pi;
>>
>> t90 = %pi/2 - t;  *//redefine angle-convention consistent with
>> loudspeaker plots*
>>
>> theta = t;   *// keep Scilab angles for theta*
>>
>> rho1 = 1 + sin(t90).^2;  *// use new angle mapping for rho1*
>>
>> rho2 = 1 + 2*cos(t90).^2;  *// use new angle mapping for rho2*
>>
>> *polarplot*([theta,theta], [rho1,rho2]);
>>
>> a=*gca*();
>>
>> set(a,'rotation_angles',[180,0]);  *// rotate plot axes*
>>
>> *// END OF CODE*
>>
>>
>>
>> Regards,
>>
>> Rafael
>>
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>>
>>
>
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Re: [Scilab-users] Polarplot help

2018-01-21 Thread Claus Futtrup 
Hi Rafael

Array notation. After Reading your suggestion I looked at the documentation
of polarplot and this is not explicitly treated, so I missed that one.
Thank you.

Best regards,
Claus

On Sun, Jan 21, 2018 at 1:08 PM, Rafael Guerra 
wrote:

> Hi Claus,
>
>
>
> Regarding your problem of not being able to plot all curves in one go
> preserving the scales, if I am not mistaken this can be solved by invoking
> polarplot with a single call using array notation.
>
> See example here below with 2 curves for simplicity:
>
>
>
> *// START OF CODE*
>
> *clf*
>
> t = 0:0.01:2*%pi;
>
> t90 = %pi/2 - t;  *//redefine angle-convention consistent with
> loudspeaker plots*
>
> theta = t;   *// keep Scilab angles for theta*
>
> rho1 = 1 + sin(t90).^2;  *// use new angle mapping for rho1*
>
> rho2 = 1 + 2*cos(t90).^2;  *// use new angle mapping for rho2*
>
> *polarplot*([theta,theta], [rho1,rho2]);
>
> a=*gca*();
>
> set(a,'rotation_angles',[180,0]);  *// rotate plot axes*
>
> *// END OF CODE*
>
>
>
> Regards,
>
> Rafael
>
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Re: [Scilab-users] Polarplot help

2018-01-21 Thread Claus Futtrup 
Hi Rafael

Thank you. It works. Interesting how the 'set' command alone can do the
trick:

set(a,'rotation_angles',[180,0]);

Excellent. :-)

Best regards,
Claus

On Sun, Jan 21, 2018 at 12:55 PM, Rafael Guerra 
wrote:

> Hi Claus,
>
>
>
> For the angles orientation problem in polar plot and correct labelling,
> here below a simple solution:
>
>
>
> *// START OF CODE*
>
> *clf*
>
> t = 0:0.01:2*%pi;
>
> t90 = %pi/2 - t;  *//redefine angle-convention consistent with loudspeaker 
> plots*
>
> theta = t;   *// keep Scilab angles for theta*
>
> rho = -1 + sin(t90);  *// use new angle mapping for rho*
>
> *polarplot*(theta, rho);
>
> a=*gca*();
>
> set(a,'rotation_angles',[180,0]);  *// rotate plot axes*
>
> *// END OF CODE*
>
>
>
> Regards,
>
> Rafael
>
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Re: [Scilab-users] Polarplot help

2018-01-21 Thread Rafael Guerra 
Hi Claus,

Regarding your problem of not being able to plot all curves in one go 
preserving the scales, if I am not mistaken this can be solved by invoking 
polarplot with a single call using array notation.
See example here below with 2 curves for simplicity:

// START OF CODE
clf
t = 0:0.01:2*%pi;
t90 = %pi/2 - t;  //redefine angle-convention consistent with loudspeaker plots
theta = t;   // keep Scilab angles for theta
rho1 = 1 + sin(t90).^2;  // use new angle mapping for rho1
rho2 = 1 + 2*cos(t90).^2;  // use new angle mapping for rho2
polarplot([theta,theta], [rho1,rho2]);
a=gca();
set(a,'rotation_angles',[180,0]);  // rotate plot axes
// END OF CODE

Regards,
Rafael
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Re: [Scilab-users] Polarplot help

2018-01-21 Thread Rafael Guerra 
Hi Claus,

For the angles orientation problem in polar plot and correct labelling, here 
below a simple solution:


// START OF CODE

clf

t = 0:0.01:2*%pi;

t90 = %pi/2 - t;  //redefine angle-convention consistent with loudspeaker plots

theta = t;   // keep Scilab angles for theta

rho = -1 + sin(t90);  // use new angle mapping for rho

polarplot(theta, rho);

a=gca();

set(a,'rotation_angles',[180,0]);  // rotate plot axes

// END OF CODE

Regards,
Rafael
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Re: [Scilab-users] Polarplot help

2018-01-20 Thread Claus Futtrup 
Hi Philippe

Thank you for the pointer. It works. To everybodys amusement, here comes a
script (with data reduced from more than 13000 to 21, so it can be posted
here). The reason is I have a new problem. Plotting in this case 3 set of
data, polarplot seems to auto_scale and turning it off doesn't work (??).
Please see this one:

// Test datafrequencies = [200 2000 2]; // Hzangles = [0 30 60 90
120 150 180]; // degrees - convert to radians!mag00 = [69.253448
92.163385 87.414209]; // on-axis freq-responsemag30 = [68.461357
90.569082 76.073549];mag60 = [65.842262 90.745621 74.152067];mag90 =
[59.420658 80.893365 55.975304];mag120 = [52.505173 80.795915
44.363582];mag150 = [53.829987 59.793715 42.443964];mag180 =
[55.650341 73.457973 55.608187];magnitudes = [mag00' mag30' mag60'
mag90' mag120' mag150' mag180']; // 3 freq x 7 angles = 21 data
points, put into a matrix.// In the complete dataset there's 183
frequencies and 72 angles.
negative_angles = -angles(2:7);neg_angle_magnitudes = magnitudes(:,2:7);
angles = [angles negative_angles];magnitudes = [magnitudes
neg_angle_magnitudes];
[angles idx] = gsort(angles,'g','i');magnitudes = magnitudes(:,idx);
// Polar plot example:
polplt = scf();
p = gca(); // p = "polarplot" ... how ingenious :-/
polarplot(%pi*angles/180,magnitudes(1,:));
p.auto_scale = "off";
polarplot(%pi*angles/180,magnitudes(2,:)); // index 2 = 2 kHz
polarplot(%pi*angles/180,magnitudes(3,:));
legend("200 Hz","2 kHz","20 kHz");
p = gca(); // p = "polarplot" ... how ingenious :-/
idx=find(p.children.type=="Text");
p.children(idx).visible="off";


My "problem" is I cannot just specify polarplot to plot all three curves in
one go. So I execute one at the time, but now see the axis changes for each
of them (in the same figure)...

I hope it makes sense what I'm trying to do and my problem is
understandable.

Best regards,
Claus

On Sat, Jan 20, 2018 at 4:21 PM, philippe  wrote:

> Hi,
>
> Le 20/01/2018 à 11:08, Claus Futtrup a écrit :
> >
> >
> > How can I rotate the labels of the polarplot so that zero is up the
> > y-axis instead of out the x-axis? Alternatively, how can I disable the
> > labels?
>
> look at the Axis handle, the labels of a polar plot are additional
> children  of "Text" . Try this example :
>
>
> clf
> t = 0:0.01:2*%pi;
> polarplot(t, -1 + sin(t));
> A=gca()  // get the axis handle
> A.children//  look at all its children
> //The labels are those of "Text" type
> id=find(A.children.type="Text" )// get their id
> //then modify the properties of the handles
> A.children(id).visible="off" // no labels
> A.children(id).visible="on" // all labels
> A.children(id).text="mylabel" // change labels
> for k=id
> A.children(k).text=string(k);
> end
>
>
> Philippe
>
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Re: [Scilab-users] Polarplot help

2018-01-20 Thread philippe 
Hi,

Le 20/01/2018 à 11:08, Claus Futtrup a écrit :
> 
> 
> How can I rotate the labels of the polarplot so that zero is up the
> y-axis instead of out the x-axis? Alternatively, how can I disable the
> labels?

look at the Axis handle, the labels of a polar plot are additional
children  of "Text" . Try this example :


clf
t = 0:0.01:2*%pi;
polarplot(t, -1 + sin(t));
A=gca()  // get the axis handle
A.children//  look at all its children
//The labels are those of "Text" type
id=find(A.children.type="Text" )// get their id
//then modify the properties of the handles
A.children(id).visible="off" // no labels
A.children(id).visible="on" // all labels
A.children(id).text="mylabel" // change labels
for k=id
A.children(k).text=string(k);
end


Philippe

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[Scilab-users] Polarplot help

2018-01-20 Thread Claus Futtrup 
Dear Scilabers

This weekend I'm trying to do some polar plots and experiment with GUI.

What I'm trying to do is quite similar to Example 3 in the help:
https://help.scilab.org/docs/6.0.0/en_US/polarplot.html

I work with  loudspeakers and in our industry it's standard to have the
zero degree angle up the y-axis (as in above Example 3).

How can I rotate the labels of the polarplot so that zero is up the y-axis
instead of out the x-axis? Alternatively, how can I disable the labels?

Best regards,
Claus
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