MATLAB: How to import data from an excel file and save it as a variable

cleareddataerrorexcelimportvariable

importdata('arm_biomech_hw.csv') t=arm_biomech_hw(:,1)

When ran, this script returns an error reading "reference to a cleared variable." I do not understand how the variable is cleared, considering it is loaded immediately before it is used.

Best Answer

The importdata function (and all file import functions except load) have to have variables in which to put the data they import.

See if something like this works:

arm_biomech_mtx = importdata('arm_biomech_hw.csv');
t = arm_biomech_mtx(:,1);

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MATLAB: How to import this CSV file

Save the file as xls or xlsx and then use xlsread to import the parts of the file that you need

MATLAB: Isolate a variable

If your input is x^2 + 2 + x then you cannot isolate x to one side of an equation, as your input is not an equation.

If your input is implicitly x^2 + 2 + x = 0 then your example output of x = x^2 + 2 is incorrect: instead x = -x^2 - 2

You cannot always isolate one variable -- not unless you are willing to make some restrictions on the form of the equation.

If you have a polynomial as input, then

S = x^2+2+x;
c = sym2poly(S);
isolated_x = x * c(end-1) - S;

Best Answer

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