Remove zero rows and columns from a matrix - Сообщения
#1 Опубликовано: 19.04.2021 22:44:50
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 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
#2 Опубликовано: 20.04.2021 02:59:54
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
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Andrey Ivashov 20.04.2021 05:39:00
#3 Опубликовано: 20.04.2021 04:47:25
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
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
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Andrey Ivashov 20.04.2021 05:39:00
#4 Опубликовано: 20.04.2021 08:30:53
Function 'nonZerosRowsCols".
I get an error and invalid answers as shown, apparently when some non-zero values have decimals.
I get an error and invalid answers as shown, apparently when some non-zero values have decimals.
Look within!... The secret is inside you.
Best Regards
Eng. NDTM Amarasekera - Sri Lanka
#5 Опубликовано: 20.04.2021 08:42:13
... for that particular example.
#6 Опубликовано: 20.04.2021 09:09:51
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#7 Опубликовано: 20.04.2021 10:12:50
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
sergio
OK has been corrected (do not consider this message)
sergio
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Davide Carpi 20.04.2021 11:03:00
#8 Опубликовано: 20.04.2021 11:08:17
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.
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#9 Опубликовано: 20.04.2021 13:01:58
... alternately: brute force works well.
It has very many applications for purpose.
Take care all Collabs ... Jean
Page28 BruteForce.sm
It has very many applications for purpose.
Take care all Collabs ... Jean
Page28 BruteForce.sm
#10 Опубликовано: 20.04.2021 17:02:18
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
Best regards.
Alvaro.
rmEmptyRC.sm
Best regards.
Alvaro.
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sergio 21.04.2021 06:39:00
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