Logarithmic interval ?

Hi,

Does anybody know of a logarithmic interval implementation in Squeak where the steps in the interval go by logarithmic scale instead of linear ?

Best,

Karl

Yes,

But i don't remember if published somewhere... I'll check this evening or tomorrow 

Le dim. 3 févr. 2019 à 16:43, karl ramberg <[hidden email]> a écrit :

Hi,

Does anybody know of a logarithmic interval implementation in Squeak where the steps in the interval go by logarithmic scale instead of linear ?

Best,

Karl

I used a workaround that probably is more flexible since I have several variables that need the logarithm

steps := 100.

xLog := 0.02 log: steps.

yLog := 1.894 log: steps

1 to: steps do:[:i|    

          x := i raisedTo: xLog.

          y := i raisedTo: yLog.

          ]

Best,

Karl

On Sun, Feb 3, 2019 at 5:10 PM Nicolas Cellier <[hidden email]> wrote:

Yes,

But i don't remember if published somewhere... I'll check this evening or tomorrow 

Le dim. 3 févr. 2019 à 16:43, karl ramberg <[hidden email]> a écrit :

Hi,

Does anybody know of a logarithmic interval implementation in Squeak where the steps in the interval go by logarithmic scale instead of linear ?

Best,

Karl

Hi karl,

This is not a logarithmic interval. The progression should be geometric, that is with a constant ratio.

    x3/x2 = (x2/x1).

The ith element of geometric serie should be something like

    (ratio raisedTo: i-1) * start.

Le dim. 3 févr. 2019 à 18:15, karl ramberg <[hidden email]> a écrit :

I used a workaround that probably is more flexible since I have several variables that need the logarithm

steps := 100.

xLog := 0.02 log: steps.

yLog := 1.894 log: steps

1 to: steps do:[:i|    

          x := i raisedTo: xLog.

          y := i raisedTo: yLog.

          ]

Best,

Karl

On Sun, Feb 3, 2019 at 5:10 PM Nicolas Cellier <[hidden email]> wrote:

Yes,

But i don't remember if published somewhere... I'll check this evening or tomorrow 

Le dim. 3 févr. 2019 à 16:43, karl ramberg <[hidden email]> a écrit :

Hi,

Does anybody know of a logarithmic interval implementation in Squeak where the steps in the interval go by logarithmic scale instead of linear ?

Best,

Karl

You are right.

It would be nice to have a logarithmic interval.

Best.

Karl

On Sun, Feb 3, 2019 at 6:37 PM Nicolas Cellier <[hidden email]> wrote:

Hi karl,

This is not a logarithmic interval. The progression should be geometric, that is with a constant ratio.

    x3/x2 = (x2/x1).

The ith element of geometric serie should be something like

    (ratio raisedTo: i-1) * start.

Le dim. 3 févr. 2019 à 18:15, karl ramberg <[hidden email]> a écrit :

I used a workaround that probably is more flexible since I have several variables that need the logarithm

steps := 100.

xLog := 0.02 log: steps.

yLog := 1.894 log: steps

1 to: steps do:[:i|    

          x := i raisedTo: xLog.

          y := i raisedTo: yLog.

          ]

Best,

Karl

On Sun, Feb 3, 2019 at 5:10 PM Nicolas Cellier <[hidden email]> wrote:

Yes,

But i don't remember if published somewhere... I'll check this evening or tomorrow 

Le dim. 3 févr. 2019 à 16:43, karl ramberg <[hidden email]> a écrit :

Hi,

Does anybody know of a logarithmic interval implementation in Squeak where the steps in the interval go by logarithmic scale instead of linear ?

Best,

Karl

Hi Karl, I published GeometricInterval along with some GeometricIntervalTests at

    MCHttpRepository
        location: 'http://www.squeaksource.com/STEM'
        user: ''
        password: ''.

It is a port of VW SYSEXT-GeometricInterval from Cincom public store, a bit revisited.

Le dim. 3 févr. 2019 à 21:18, karl ramberg <[hidden email]> a écrit :

You are right.

It would be nice to have a logarithmic interval.

Best.

Karl

On Sun, Feb 3, 2019 at 6:37 PM Nicolas Cellier <[hidden email]> wrote:

Hi karl,

This is not a logarithmic interval. The progression should be geometric, that is with a constant ratio.

    x3/x2 = (x2/x1).

The ith element of geometric serie should be something like

    (ratio raisedTo: i-1) * start.

Le dim. 3 févr. 2019 à 18:15, karl ramberg <[hidden email]> a écrit :

I used a workaround that probably is more flexible since I have several variables that need the logarithm

steps := 100.

xLog := 0.02 log: steps.

yLog := 1.894 log: steps

1 to: steps do:[:i|    

          x := i raisedTo: xLog.

          y := i raisedTo: yLog.

          ]

Best,

Karl

On Sun, Feb 3, 2019 at 5:10 PM Nicolas Cellier <[hidden email]> wrote:

Yes,

But i don't remember if published somewhere... I'll check this evening or tomorrow 

Le dim. 3 févr. 2019 à 16:43, karl ramberg <[hidden email]> a écrit :

Hi,

Does anybody know of a logarithmic interval implementation in Squeak where the steps in the interval go by logarithmic scale instead of linear ?

Best,

Karl

And I have added a LogarithmicInterval which is more like numpy.logspace.

For a LogarithmicInterval, bounds are specified by their logarithm (in whatever base).

If you want 100 points from 0.1 to: 10.0, then you can write:

    (0.1 log logTo: 10 log size: 100 base: 10).

or:

    (-1 logTo: 1 size: 100 base: 10)

or you can omit the base and use ln/exp

    (0.1 ln logTo: 10 ln size: 100).

Le ven. 8 févr. 2019 à 15:56, Nicolas Cellier <[hidden email]> a écrit :

Hi Karl, I published GeometricInterval along with some GeometricIntervalTests at

    MCHttpRepository
        location: 'http://www.squeaksource.com/STEM'
        user: ''
        password: ''.

It is a port of VW SYSEXT-GeometricInterval from Cincom public store, a bit revisited.

Le dim. 3 févr. 2019 à 21:18, karl ramberg <[hidden email]> a écrit :

You are right.

It would be nice to have a logarithmic interval.

Best.

Karl

On Sun, Feb 3, 2019 at 6:37 PM Nicolas Cellier <[hidden email]> wrote:

Hi karl,

This is not a logarithmic interval. The progression should be geometric, that is with a constant ratio.

    x3/x2 = (x2/x1).

The ith element of geometric serie should be something like

    (ratio raisedTo: i-1) * start.

Le dim. 3 févr. 2019 à 18:15, karl ramberg <[hidden email]> a écrit :

I used a workaround that probably is more flexible since I have several variables that need the logarithm

steps := 100.

xLog := 0.02 log: steps.

yLog := 1.894 log: steps

1 to: steps do:[:i|    

          x := i raisedTo: xLog.

          y := i raisedTo: yLog.

          ]

Best,

Karl

On Sun, Feb 3, 2019 at 5:10 PM Nicolas Cellier <[hidden email]> wrote:

Yes,

But i don't remember if published somewhere... I'll check this evening or tomorrow 

Le dim. 3 févr. 2019 à 16:43, karl ramberg <[hidden email]> a écrit :

Hi,

Does anybody know of a logarithmic interval implementation in Squeak where the steps in the interval go by logarithmic scale instead of linear ?

Best,

Karl

Hi,

Cool. I will try it soon. I have a cold at the moment :-(

Cheers,

Karl

On Fri, Feb 8, 2019 at 10:28 PM Nicolas Cellier <[hidden email]> wrote:

And I have added a LogarithmicInterval which is more like numpy.logspace.

For a LogarithmicInterval, bounds are specified by their logarithm (in whatever base).

If you want 100 points from 0.1 to: 10.0, then you can write:

    (0.1 log logTo: 10 log size: 100 base: 10).

or:

    (-1 logTo: 1 size: 100 base: 10)

or you can omit the base and use ln/exp

    (0.1 ln logTo: 10 ln size: 100).

Le ven. 8 févr. 2019 à 15:56, Nicolas Cellier <[hidden email]> a écrit :

Hi Karl, I published GeometricInterval along with some GeometricIntervalTests at

    MCHttpRepository
        location: 'http://www.squeaksource.com/STEM'
        user: ''
        password: ''.

It is a port of VW SYSEXT-GeometricInterval from Cincom public store, a bit revisited.

Le dim. 3 févr. 2019 à 21:18, karl ramberg <[hidden email]> a écrit :

You are right.

It would be nice to have a logarithmic interval.

Best.

Karl

On Sun, Feb 3, 2019 at 6:37 PM Nicolas Cellier <[hidden email]> wrote:

Hi karl,

This is not a logarithmic interval. The progression should be geometric, that is with a constant ratio.

    x3/x2 = (x2/x1).

The ith element of geometric serie should be something like

    (ratio raisedTo: i-1) * start.

Le dim. 3 févr. 2019 à 18:15, karl ramberg <[hidden email]> a écrit :

I used a workaround that probably is more flexible since I have several variables that need the logarithm

steps := 100.

xLog := 0.02 log: steps.

yLog := 1.894 log: steps

1 to: steps do:[:i|    

          x := i raisedTo: xLog.

          y := i raisedTo: yLog.

          ]

Best,

Karl

On Sun, Feb 3, 2019 at 5:10 PM Nicolas Cellier <[hidden email]> wrote:

Yes,

But i don't remember if published somewhere... I'll check this evening or tomorrow 

Le dim. 3 févr. 2019 à 16:43, karl ramberg <[hidden email]> a écrit :

Hi,

Does anybody know of a logarithmic interval implementation in Squeak where the steps in the interval go by logarithmic scale instead of linear ?

Best,

Karl