I need the code for 1D mass spring system in finite element method please

I need the code for 1D mass spring system and the n I need to plot it.

[Image Analyst]

Is this homework? If so, tag it as such and read this: http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers If not, then read this: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[Amirhossein]

no it's not a homework. but I searched a lot and I could not find the solution