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

2 vues (au cours des 30 derniers jours)
Dan Giffin le 14 Juin 2023
Commenté : Star Strider le 14 Juin 2023
Hi,
So my code looks like:
---------------------------------------------------
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
--------------------------------------------------------------
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
------------------------------------------------------------------------------------------------
Could someone explain what the error means I tried following it and applying the steps but it doesn't make any sense to me
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Réponse acceptée

Star Strider le 14 Juin 2023
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
.
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Dan Giffin le 14 Juin 2023
Seems to work. Much appreciated!
Star Strider le 14 Juin 2023
As always, my pleasure!

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Plus de réponses (1)

Satwik le 14 Juin 2023
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
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