Hello
I am new to the use of Smath Studio, and I started by calculating the solution of a frame through the method of rigidities, the issue is that when carrying out the calculations I need to calculate a reduced matrix. For this I need to remove the rows and columns that contain zeros. I use the following function but it gives me an error, someone knows how to solve it

Wrote

Hello
I am new to the use of Smath Studio, and I started by calculating the solution of a frame through the method of rigidities, the issue is that when carrying out the calculations I need to calculate a reduced matrix. For this I need to remove the rows and columns that contain zeros. I use the following function but it gives me an error, someone knows how to solve it

I don't know if there is a ready function but you can use the one I wrote myself.
You can either remove zero rows and columns manually or with a function.
With posted function you can not perform removal if matrix elements are text.

Regards

removezeros.sm (11,71 KiB) scaricato 1215 volta(e).

Overlord forgot to tell you that the two functions it used in its function, as well as the one you used to no avail (nonZeroRorwsCols (R)), is part of an external plugin (MatrixExtensions). Could it be that you haven't loaded the plugin? because it works correctly for me.
Until recently I myself did not know its existence since here in the forum (in English) I do not think it is reviewed. Maybe it is in the Russian-language forum.

sergio

Function 'nonZerosRowsCols".
I get an error and invalid answers as shown, apparently when some non-zero values have decimals.

... for that particular example.

Another way

rmEmptyRC.sm (7,02 KiB) scaricato 1267 volta(e).

attention Davide, in the first 'if' one of the two 'max' is a 'min'

sergio

OK has been corrected (do not consider this message)

sergio

Wrote

attention Davide, in the first 'if' one of the two 'max' is a 'min'

sergio

TY, updated. Just shown the idea to have it working using the built-in features.

... alternately: brute force works well.
It has very many applications for purpose.
Take care all Collabs ... Jean

Page28 BruteForce.sm (13,19 KiB) scaricato 1508 volta(e).

Hi. normi (infinitum norm) take the maximum of the absolute values of a matrix. max and min are defined only for reals, but a version with normi will work with complex numbers too. With the technique from Davide applied to the overlod method, it works also for empty answers.



rmEmptyRC.sm (8,78 KiB) scaricato 1295 volta(e).

Best regards.
Alvaro.