Consider a matrix M(i,j). It has n columns and m rows. How do I indicate m rows for matrix M? What is the notation?
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1You can write $\mathbf{M}\in S^{m\times n}$ where $S$ is whatever set your matrix entries are elements of. – K.defaoite Jul 24 '20 at 02:33
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@AndréArmatowski I thought the rows went first? Maybe I am a little confused. – K.defaoite Jul 24 '20 at 02:37
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Oh yes right. Whoops. – K.defaoite Jul 24 '20 at 02:38
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The most general notation is : $M_{m\times n}$ – sai-kartik Jul 24 '20 at 02:40
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I wish to write: s = c x (number of rows in M). This is what I am looking for ... – MeMa Jul 24 '20 at 10:10
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This post was wrongly associated with another question that has nothing to do with my question ... – MeMa Jul 24 '20 at 10:12
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@MeMa the linked-question is perfectly valid as per the information provided in your question. If you have restrictions or if you require an answer to a specific question, then feel free to ask a new question with as many details as possible. You can also edit the current question and add all the required details. Then, reopen the question. – an4s Jul 24 '20 at 20:20
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ok, thank you. I just posted the same question in a new envelope. – MeMa Jul 25 '20 at 17:55