Data from excel with operators

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Lepakshi Ramkiran
Lepakshi Ramkiran 2020년 5월 11일
댓글: Lepakshi Ramkiran 2020년 5월 12일
I have a excel sheet with two coloumns. One has a name other has the corresponding mass to it. I have used the correspèonding line to read it and find the position of the name. But when i am trying to fing the mass to the corresponding name as shown below it is not able to store it in the memory. In the excel i have the mass values as 1.989*10^30. this seems to affect the code as the same code works fine when the cells in the excel has just numeric values.
majbod = 'Sun';
minbod = 'Earth';
majbodin = readtable("Major_and_Minor_Bodies.xlsx","Sheet",1);
minbodin = readtable("Major_and_Minor_Bodies.xlsx","Sheet",2);
MAJORBODY = table2array(majbodin(:,"Major_Body"));
MINORBODY = table2array(minbodin(:,"Minor_Body"));
mmaj = table2array(majbodin(:,"Mass"));
mmin = table2array(minbodin(:,"Mass"));
selected_majbody = find(strcmp(MAJORBODY,majbod));
selected_minbody = find(strcmp(MINORBODY,minbod));
M = mmaj(selected_majbody);
m = mmin(selected_minbody);
disp([M ;m])
I have attached the excel file with the code. Please help me with this.
Is there a better way to write the code compared to the way which I wrote?
Thanks.

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Cris LaPierre
Cris LaPierre 2020년 5월 11일
편집: Cris LaPierre 2020년 5월 11일
The main issue you are having is that your numbers are not numbers, but text. If possible, update your numbers in Excel to use this notation instead: 1.989E+30
That way, the mass can be read in as a number. Otherwise, convert the text representation of the number to a number.
Is there an easier way? Yes! Use the table to your advantage. Make the object the row name, and then reference it by name.
opts = spreadsheetImportOptions("NumVariables", 2);
% Specify sheet and range
opts.Sheet = "Sheet2";
opts.DataRange = "A2";
% Specify column names and types
opts.VariableNames = ["Minor_Body", "Mass"];
opts.VariableTypes = ["categorical", "string"];
minorBodies = readtable("Major_and_Minor_Bodies.xlsx", opts,"ReadRowNames",true);
%This next line replaces the " *10^" with "e"
minorBodies.Mass=str2double(regexprep(minorBodies.Mass,['(\s*)+\*10\^'],['e']));
Now when you want to reference a mass, use the rowname.
minorBodies.Mass("Saturn")
ans = 5.6830e+26
  댓글 수: 6
Lepakshi Ramkiran
Lepakshi Ramkiran 2020년 5월 12일
yup that was it. thanks a lot.

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