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creating new matrix based on column value

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Benjamin
Benjamin 2018-11-5
评论： madhan ravi 2018-11-5
I have a data file that is 3 columns (Density, Temp, Pressure)
I generate the data using C++ and it loop through all possible density and temperatures to calculate a pressure. The issue is I want to connect the lines of Density vs. Pressure at a given temp (isotherms). Is there a way to do this in MATLAB? Alternatively, is there a way to create a new matrix that has Density in the first column, and the pressure at a given temp is in column 2, and when temp changes from original matrix, it creates a new column at the next given temp.
The current structure:
Density Temp. Pressure
1 300 1
2 300 1.1
...
4 300 1.2
1 400 1.05
2 400 1.12
...
4 400 1.23
So it would take this matrix that I already have and create a new one that looks like this:
Density Pressure(@300 K) Pressure(@400 K) etc...
1 1 1.05 ...
2 1.1 1.12 ...
...
4 1.2 1.23 ...

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回答（1 个）

madhan ravi
madhan ravi 2018-11-5
编辑：madhan ravi 2018-11-5
have a look at readtable() and tables()
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