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## how to use the EJSS histogram for counting of a value say theta for Rutherford angle of deflection? post and replies

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how to use the EJSS histogram for counting of a value say theta for Rutherford angle of deflection?

lookang
222 Posts

Dear Prof Paco,

i am able to use the histogram in JavaScript flavor using the input as variable i defined as "theta". i am surprised that the y axis is counting the time value of theta, meaning if theta = 0.5 for t = 3.0 to 4.8 s, the histogram draws theta = 0.5 with a bin and the height of that bin is t = 1.8 s the duration of the value of which theta is at.

how do i make EJSS count it as a single value N =1?

the code didn't work //_view.histogram.append(theta);

attached is my source code example of Rutherford experiment, an original idea for a EJSS that i just created yesterday.

http://iwant2study.org/ospsg/index.php/interactive-resources/physics/06-quantum-physics/02-nuclear/324-rutherford-s-atomic-model

thank you very much for making EJSS my number one choice modeling tool!

Post edited December 17, 2015 at 8:14 PM EST.

Attached File: ejss_src_ruthorford.zip

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### Replies to how to use the EJSS histogram for counting of a value say theta for Rutherford angle of deflection?

Re: how to use the EJSS histogram for counting of a value say theta for Rutherford angle of deflection? -

lookang
222 Posts

oh, i managed to solved it by introducing a histogramcounter for the active state of the histogram.

but now there a default value theta=0, N=1, at the beginning of the simulation, which i speculate is a bug in ejss?

http://iwant2study.org/ospsg/index.php/interactive-resources/physics/06-quantum-physics/02-nuclear/324-rutherford-s-atomic-model

thanks!

Post edited December 20, 2015 at 8:57 PM EST.

Post edited December 20, 2015 at 8:58 PM EST.

Attached File: 2015-12-21_0952.png

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