There are ways to change the exponent display of the axis rulers using the NumericRuler Properties, however that is not necessary here. Just multiply the plot arguments by the appropriate scaling factors —
%Define variables
sigma = 35*10^6;
young_modulus = 90*10^9;
strain_coefficient = 6*10^-9;
magnetic_field = linspace(0, 160000);
%Function
stress = (sigma/young_modulus) + (strain_coefficient*magnetic_field);
%Create Plot
figure
plot(magnetic_field, stress)
xlabel('Magnetic Field Intensity (A/m)')
ylabel('Microstrain (m/m)')
title('Microstrain vs. Magnetic Field Intensity')
figure
plot(magnetic_field*1E-3, stress*1E+6)
xlabel('Magnetic Field Intensity (kA/m)')
ylabel('Microstrain (\mum/m)')
title('Microstrain vs. Magnetic Field Intensity')
Make appropriate changes to get different results.
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