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Engineering Drawing - Science topic

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There are quite a few good plotting software and packages available to draw professional graphs and visualize data. Some of them are paid, some are free; some are language-based, some are independent. Which one do you prefer and why?
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R provides very nice graph but it involves some commands/programming to do it. You can use a template of what others have done. R can be downloaded for free.
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Formally, a computer program should be able to scan such an image, perform image processing or any specific treatment on it and produce the followings.
1) The info about multiple geometrical shapes stacked together in front/side and top views in the image.
2) The correlation between the two views as some shapes (or a part of a shape) are hidden in one view but their projections are seen in the other view.
3) The relationship among shapes such as the orientation of a shape w.r.t. to each other.
4) The info about dimensions normally written in text besides arrows.
5) The info about arrows, single-headed, double-headed, straight, slanted, etc.
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Fabio, is " Convex Polygon Fitting in Robot-Based Neurorehabilitation" the work you referenced which has all the examples and the code?? I have sent you a request for the article. Could you please send it across? Thanks
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Or I should apply the controllable canonical form to the plant and put the positive refeeding ?
Does the controllable canonical transformation serving exactly?
Thank you very much.
A greeting.
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No your image is correct.
If your error is not zero you will get a ‘Epsilone’ since you have the difference between a positive setpoint and a negative output.
Good understanding 
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How to prove that mathematically?
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Depends on whether you mean the surface, or cross-sectional.  Certainly historically the mathematical basis for this has been the Radon Transform, which is the projection of the image intensity along a radial line oriented at a specific angle (http://www.mathworks.com/help/images/ref/radon.html)
That however is on the basis of a line integral through an object, which when rotated about multiple angles is used as the basis for Computed Tomography.  
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Drawing in general requires some imagination and many students are having difficulty in acquiring this skill. I think the complexity of this subject could be modeled through cognitive science findings. For example, we may take an advantage of the findings of mental images and develop a curriculum that mitigate this complexity.
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Dear Professor,
Mechanical Engineering Drawing/Engineering Drawing is a challenging subject to teach and also to learn. In my class room i ask the students first to build models (using chart sheets) of various solids which gives them idea about the 3D modeling and also development of surfaces. I ask them to keep the models on the table while explaining the drawing problem. This makes my students feel happy and find the subject easy to learn.
Learning engineering drawing will improve logical thinking and imagination in students.
with regards,
P.Thirumal
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I am looking for a software can measure the length of curves (the red region). Can someone recommend some easy (preferably free) way to do this?The circles are in tangent to each other.
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You can transform the arcs in polylines and in the list of properties to get the corresponding lengths:
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Is there any change in knot vectors between uniform & nonuniform Bspline? What are the equations used to calculate Knot vectors in both of these cases?
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Knot values decide the range on which a particular basis function influences.
In case of 'Uniform B Spline', knot values are uniformly spaced, non-repeating (single multiplicity) e.g. 0, 1, 2, 3, 4, 5, 6, 7
In case of 'Non Uniform B Spline', spacing changes (but they are always in increasing order) and there can be repetitions. e.g. 0 0 0 1 2 2 2. If 'k' is the order then first and last 'k' values are same (to pin it down to first and last points respectively) and middle values can be adjusted.
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Building information modeling (BIM) is a process involving the generation and management of digital representations of physical and functional characteristics of a facility. The resulting building information models become shared knowledge resources to support decision-making about a facility from earliest conceptual stages, through design and construction, through its operational life and eventual demolition.
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I suggest this book:" BIM Content Development. Standards, strategies and best practices". R.S. Weygant.