## 235 Reputation

12 years, 362 days

## Statistics and Weibull distributions...

Maple

I have been able to sucessfully use the WeibullPlot function of the statistics package.

Is there an output option (similar to summarize = true for other regressions) for the (reference=true) intercept of (X) value (eta) with the 0.632 line and and slope (Beta) of the line, r^2, etc.?

Thanks,
Bill

## Weibullplot (and Log plots) subticks set...

Maple

Hello,

I am using the Weibullplot function and have gotten a good plot out.  The issue is the gradations on the subticks per decade.

If I set it to three (3) I get 0.2, 0.3, 0.4 subgrid correctly, but only 0.6, 0.7, 0.8 between ).5 and 1.0.

If I set it to four (4) - I get the reverse.

Is this a log plot issue or a weibullplot function issue with respct to setting the subticks on the 10ths correcty of a decade span?  I look forward to thoughts.

with(Statistics);
XX := RandomVariable(Weibull(1, 0.6));
AA := Sample(XX, 100);

AA is a sample matrix of 100 Weibull distributed data points.

WeibullPlot(AA, reference = false, style = line, gridlines = true, size = [800, 500], axis = [tickmarks = [default, subticks = 4], color = darkgreen])

WeibullPlot.mw

Thanks,
Bill

## "shortcut" notation for matlab matrix so...

Maple

Does anyone know the difference between the standard inv(A)*b to solve A*x=B linear system vs. the A\b usage by Matlab?  I believe they are different in method.

I can correctly solve with MatrixInverse(A).b for x but was wondering the differences, accuracy and overall shortcut command versus typing the full MatrixInverse function.

Just trying to improve my portability knowledge.

Bill

Maple

Hello,

I am manually re-creating the TS diagram for phase plot of fluid=air for use in a report as a pretty plot.   The TemperatureEntropyChart function is colored in grayscale.  I really need to change to colorized for additional data being added.

The code to generate the various isobars color gradient is shadebetween two curves.

Using the code method to plot leaves white gaps in the discontinutiy of the plot curves returned from the Property function at the liquid and vapor lines.   I have manually connected the horizontal "under the dome" in a matrix of X,Y for each of two isobar curves.

However, the shadebetween doesn't seem to like the two X,Y matrices for the curves as inputs to shadebetween.

So,...   Q:   1.)  Can the color be changed using the TempertureEntropyChart function,..or
2.)  Can matrices of unequal X,Y values (scatterplot type data sets) be used for the curves in shadebetween command?  The help infers the Y (v, of (u,v))  values need to match.

Thanks,
Bill

Ref:    worksheet contained at:  https://www.mapleprimes.com/maplesoftblog/203462-Computing-With-Thermophysical-Data