Adding a single number to an entire matrix

How do you add a single number to each element within a matrix?

i.e.

a = 5

b = (1,2,3;4,5,6;7,8,9)

c = a + b

Answer 1

[Star Strider]

Exactly as you wrote it!

a = 5

a = 5

b = [1,2,3;4,5,6;7,8,9]

b = 3×3

1 2 3 4 5 6 7 8 9

c = a + b

c = 3×3

6 7 8 9 10 11 12 13 14

Use square brackets [] to code vectors and matrices.

[David Ebert]

in R2022b implicit expansion seems to not be included anymore unfortunately... :(

[John D'Errico]

@David Ebert Really? You would, of course, be completely wrong. Do you honestly think they would just remove a major feature of the language, something present since MATLAB was first written. That would completely disable every piece of code ever written, millions of lines of code.

a = 5;
b = [1,2,3;4,5,6;7,8,9];

c = a + b

c = 3×3

6 7 8 9 10 11 12 13 14

Implicit expansion of scalars is still included as a part of MATLAB syntax, as it always has been. If you think it has been removed, then show where you think it was removed as a fresh question, and we can explain why that is incorrect..

[David Ebert]

@John D'Errico Thanks for getting back to me so quickly! I am trying to simply add one constant to all values within an array, however the error message keeps coming back as:

Error using +

Arrays have incompatible sizes for this operation.

Even with bsxfun as seen below:

s_calculate_total_projected_sl = bsxfun(@plus, s_combined_projected_tc_and_predicted_sw, s_get_projected_MMSL);

An error message comes back as:

Error using bsxfun

Non-singleton dimensions of the two input arrays must match each other.

In version R2021b this was always not an issue, and worked fine. I would appreciate any insight into this.

Thanks!

Best,

David

[Walter Roberson]

What is

size(s_combined_projected_tc_and_predicted_sw)
size(s_get_projected_MMSL)

at the time of the problem?

[David Ebert]

Oh, I have made a mistake. I'm sorry. One of the values was not found, giving an empty vector, no wonder.