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

Question

Dan Giffin 2023-6-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1983084-help-with-error-using-matrix-dimensions-must-agree

评论： Star Strider 2023-6-14

采纳的回答： Star Strider

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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Answer 1

Star Strider 2023-6-14

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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 2023-6-14

Seems to work. Much appreciated!

Star Strider 2023-6-14

As always, my pleasure!

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Answer 2

Satwik 2023-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/1983084-help-with-error-using-matrix-dimensions-must-agree#answer_1255774

在 MATLAB Online 中打开

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