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Select Subset of Matrix by Indices
I have a matrix that captures about 100 rows of data, but I want to take a sub-range of ~60 rows from the matrix. Is there a syntax for selecting rows and/or columns of a matrix by index-ranges? An example would be I want to copy all columns within rows 10 through 70.
I would like to do this under either Matshell or the Transform modules of TestShell Studio.
Hi,
Not sure if this answers your question: say you have a matrix variable M1 of string type with 100 rows and 10 columns; then M1(10:70, :) is sub-matrix of M1, having all columns within rows 10 through 70.
So the syntax of any subset of a matrix is <Matrix variable name>(<row index range>, <column index range), where row or column index range can be "m:n" (meaning index m through n), "m:end" (meaning index m through the end, or in other word last row/column), or ":" (meaning all rows/columns). Depending on the actual dimension of this subset, it can be a matrix (like in your example), a vector, or a scalar.
In addition when using Matrixes in TestShell/CloudShell Authoring you can also specify rows and columns by the value in the first spot respectively. This also carries over to specifying ranges as well.
In this example, I built a simple matrix that would double as a look up table:
screen-shot-2017-11-17-at-132731.png
to build the sub_matrix table, this is the code:
sub_matrix = my_m('Dog':'Cat', :)
