How to remove the scientific notation such as -1.200340354078778e+11 from a matrix?

Hello,

I have a matrix A that have values such as (-1.200340354078778e+11), how to remove this I order to round the values to the nearest 5 decimal? I need this matrix A to multiply it by the double matrix B.

Regards

[Walter Roberson]

What output would you want from (-1.200340354078778e+11) ? -120030000000 ? -120034035407.87800 ?

Your invsw entries range in absolute value from 4.75582810386029e9 to 1.86639023098654e12 . Do you want them rounded to 5 decimal points individually, or 5 relative to the 1e12 value? Should 4.75582810386029e9 become 4.7558e9 (5 decimal places for it) or to 0.00476e12 so that the number of trailing 0 align for the values ?

[Sarah A]

actually, it seems I did a mistake in getting invsw, thanks for your help.

Answer 1

[Star Strider]

Use the format (link) function.

format short
q = -1.200340354078778e+11

q =
  -1.2003e+11

The internal precision remains unchanged.

[Star Strider]

In general, calculating the inverse of a matrix is discouraged, at least in the context of MATLAB.

What do you want to do with your matrix that requires your taking the inverse of it?

[Walter Roberson]

rounding the inverse of a matrix is typically bad mathematics. Matrix inverses are rather sensitive.

Your invsw is not the inverse of sw. Your sw only has rank 87 rather than 90.

>> max(max(sw * invsw))
ans =
        99117485673797.8

That should be approximately 1 if the two are inverses.

[Sarah A]

Yeeeees. you are right! that's why I got these values.

Answer 2

[madhan ravi]

round((-1.200340354078778e+11),5)

Or

A=vpa((-1.200340354078778e+11))
round(A)

[Sarah A]

thanks for answering but it change the type of matrix A from double to sym, and I want to multiply A by another double matrix which is B.

[Walter Roberson]

round() does not change to sym.

[madhan ravi]

Exactly , it doesn’t change to sym as sir Walter mentioned. If you think it changes you can check class of the variable by typing whos A in command window