Extract value based on degree and order of spherical harmonic in triangular (upper and lower) matrix

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Adilla Zulkifli 2020-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/673193-extract-value-based-on-degree-and-order-of-spherical-harmonic-in-triangular-upper-and-lower-matrix

编辑： Adilla Zulkifli 2020-12-2

Hello,

I have a matrix A [61x61] where the upper triangular matrix consist of sine coefficient of spherical harmonic for degree (column) and order (row) up to 60. Meanwhile the lower triangular matrix is the value of cosine coefficient for the same number of degree (row) and order (column).

How do I extract the value based on certain degree and order of sine or cosine coefficient?

Thank you.

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KALYAN ACHARJYA 2020-12-2

在 MATLAB Online 中打开

"How do I extract the value based on certain degree and order of sine or cosine coefficient?"

The "A" matrix having 61x61

For sin Coeffcients, row must be less than columns

A(rows_number,columns); %Here rows_number<columns

For cosine Coeffcients, row must be greater than columns

A(rows_number,columns); %Here rows_number>columns

Hope I undestood the question correctly. If not, can you clarify more?

Adilla Zulkifli 2020-12-2

编辑：Adilla Zulkifli 2020-12-2

For sine coefficients, the value for the upper triangular matrix starts from row 1-60, column 2-61. Meanwhile for cosine coefficients at lower triangular matrix the value starts from row 1-61, column 1-61. This is because for sine coefficient, the 0 degree and order has 0 value. Did you get the picture of the matrix form for sine and cosine coefficients?

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