Data from excel with operators

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Lepakshi Ramkiran
Lepakshi Ramkiran 2020-5-11
评论： Lepakshi Ramkiran 2020-5-12
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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采纳的回答

Cris LaPierre
Cris LaPierre 2020-5-11
编辑：Cris LaPierre 2020-5-11
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
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Cris LaPierre
Cris LaPierre 2020-5-12
It's not 0, it's 0.000e+26
1.0e+26 *
5.6830
5.6830
0.0000
The value is being hidden because the magnitude of the other values are so high. Remove the semicolon from the end of the line that assigns a value to rma to see it.

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