Help with "Error using / Matrix dimensions must agree."

Hi,

So my code looks like:

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Air_desnity=[0.646:0.01:1.225];

W_412_MTOW=5534;

A_412=153.93804;

Power_412=(W_412_MTOW*9.81)^3/(2*Air_desnity*A_412).^0.5

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And the error is:

Error using /

Matrix dimensions must agree.

Error in Power (line 6)

Power_412=(W_412_MTOW*9.81)^3/(2*Air_desnity*A_412).^0.5

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Could someone explain what the error means I tried following it and applying the steps but it doesn't make any sense to me

Answer 1

[Star Strider]

Use element-wise division, so (./) instead of (/) —

Air_desnity=[0.646:0.01:1.225];
W_412_MTOW=5534;
A_412=153.93804;
Power_412=(W_412_MTOW*9.81)^3./(2*Air_desnity*A_412).^0.5

Power_412 = 1×58

1.0e+13 * 1.1345 1.1259 1.1174 1.1091 1.1010 1.0930 1.0853 1.0777 1.0702 1.0629 1.0558 1.0488 1.0419 1.0352 1.0285 1.0221 1.0157 1.0095 1.0033 0.9973 0.9914 0.9856 0.9799 0.9743 0.9688 0.9633 0.9580 0.9528 0.9476 0.9425

.

[Dan Giffin]

Seems to work. Much appreciated!

[Star Strider]

As always, my pleasure!

Answer 2

[Satwik]

In order to perform elementwise division you should use ./ instead of /

Air_desnity=[0.646:0.01:1.225]

Air_desnity = 1×58

0.6460 0.6560 0.6660 0.6760 0.6860 0.6960 0.7060 0.7160 0.7260 0.7360 0.7460 0.7560 0.7660 0.7760 0.7860 0.7960 0.8060 0.8160 0.8260 0.8360 0.8460 0.8560 0.8660 0.8760 0.8860 0.8960 0.9060 0.9160 0.9260 0.9360

W_412_MTOW=5534;
A_412=153.93804;
Power_412=(W_412_MTOW*9.81)^3./(2*Air_desnity*A_412).^0.5

Power_412 = 1×58

1.0e+13 * 1.1345 1.1259 1.1174 1.1091 1.1010 1.0930 1.0853 1.0777 1.0702 1.0629 1.0558 1.0488 1.0419 1.0352 1.0285 1.0221 1.0157 1.0095 1.0033 0.9973 0.9914 0.9856 0.9799 0.9743 0.9688 0.9633 0.9580 0.9528 0.9476 0.9425